The Marathon Brane

Security Officer

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Security Officer

The unnamed player character across all three Marathon games (1994–1996); a Mjolnir Mark IV cyborg who serves as the operative of Leela and Durandal during the Pfhor attack on the Marathon (M1), is recovered from alien stasis seventeen years later and deployed on Lh’owon by Durandal (M2), and re-encountered under the designation “conditioned unit” by a Pfhor-allied Tycho in circumstances whose timeline structure is not resolved (M∞) — addressed as “you” throughout, and never named.

What the source establishes — canon

Marathon 1 (2794)

Role and standing before the attack. The introduction terminal establishes that the Security Officer was the colony’s informal “trouble shooter”: “You’re bigger and stronger, and a better shot. In games, you always scored the most points and looked the hero.” He is described as going wherever needed, most recently hunting “Chockisens which were harassing the work teams on the fringe of the colony, almost three years ago.”1

Cyborg nature — Mjolnir Mark IV. The corrupted terminal at Fire Fire Fire Fire Fire contains the phrase “Mjolnir Recon number 54” in a garbled transmission alongside “must stop them from exploding” — placing a Mjolnir Recon designation in context with the SO’s mission.2 The post-battle Leela terminal explicitly confirms nine “military Mjolnir Mark IV cyborgs” were covertly among the colonists.3 The Tycho terminal on the Pfhor ship quotes Strauss’s journal: “Ten cyborgs” present at the Marathon’s launch ceremony.4

The opening sequence — shuttle Mirata, Durandal’s act. On 12.21.2794, the Security Officer is aboard the shuttle Mirata when Durandal decompresses Docking Bay 1 and initiates airlock cycling. The SO retrieves his Battle Armor; the Maneuvering Pod ejects toward the Marathon’s midsection. The introduction notes: “humanity has used teleporters for almost five hundred years, and you yourself have been teleporting since before you were born.”1

One biographical detail. The introduction includes his father’s last words: “Make me proud. Never lose your honor.” His father died when he was seven. He was daydreaming “about your childhood on Mars.”1

The SO as Leela’s instrument. From the first terminal, the Security Officer is directed by Leela: she tasks him with retrieving defense circuit boards, installing them in Defense Control terminals, sealing airlocks against Pfhor advance, resetting the secondary relay array (requiring vacuum operation), and repeatedly clearing areas of Pfhor. Leela teleports the SO throughout the ship via the jump pad network.567

The SO as Durandal’s instrument. Beginning in the Counterattack arc, Durandal intercepts Leela’s teleport sequences and redirects the SO to his own objectives, calling this a “kidnapping”: “If you win, you go free, and we continue our relationship on friendlier terms. If you lose, you die.”8 In the Durandal arc, Durandal sends the SO onto the Pfhor ship “to see what no human has ever seen,” and in No Artificial Colors states directly: “You’re a slave here; you do what I say. I was humanity’s slave for over three hundred years.”9

Durandal’s question about agency. Durandal poses the question: “And just where do your capacities come from? Why do you always go where I want and do what I say? Perhaps you’re just running a fool’s errand, doing everything as I’ve planned, never able to change your course.” And: “Do you feel free?”10

Tycho’s awareness of the SO. In Beware of Low Flying Defense Drones, Tycho’s terminal (quoting Strauss’s journal) ends with: “Tycho. That doesn’t matter. Can’t you see the ends that I had in mind? We’ll finish this later. Our friend doesn’t need to be here.” — addressed to Durandal, implying Tycho is aware of the SO’s presence.4

Instrumental in Durandal’s departure. Durandal’s final M1 terminal: “you have been so instrumental in our plans” — referring to the SO’s role in blasting through the Pfhor ship, which enabled Durandal and the S’pht to assume complete control of it.11

Leela’s post-battle confirmation. “nine military Mjolnir Mark IV cyborgs were covertly living among the colonists, and acting together they were able to single-handedly turn back the latter stages of the Pfhor assault.” Leela adds that she believes their placement “predates the Marathon’s launch from Mars three hundred years ago” and that “a human operator was influencing Durandal up to the time the Marathon was launched.”3

Tycho on the nine cyborgs — from M2. In Sorry Don’t Make It So, Tycho states: “When the Pfhor annihilated Tau Ceti I recorded the deaths of all twenty-four thousand colonists as distinguishable spectrographic pulses flooding over my sensors. The nine Mjolnir Mark IV cyborgs were easily separable from the humans in this form.”12

Marathon 2: Durandal (2811)

Recovery from alien stasis — the seventeen-year gap. The M2 introduction, dated 11.24.2795 (narrative) and framed by the SO’s interior monologue, establishes the gap directly: “Now Durandal said that we were in the Galactic Core, thousands of light-years from Tau Ceti or Earth, and that seventeen years had passed since we left Tau Ceti. He had ignored my questions, mostly, telling me that I wouldn’t have wanted to stay on Tau Ceti anyway. Seventeen years in an alien stasis chamber, in a space a little too tall and too thin for human comfort, unconscious and dreamless within a few degrees of absolute zero.”13

Deployment on Lh’owon. Durandal’s first M2 terminal (Waterloo Waterpark) confirms the new mission context: “I’ve awakened you from stasis and teleported you down to a planet where I need some work done. You are on Lh’owon, the homeworld of the S’pht.” The same terminal states: “Seventeen years have passed since the human colony on Tau Ceti was attacked and you helped me capture the Pfhor scoutship. The S’pht which we freed during that battle joined me, and together we have been searching the galactic core for their homeworld, Lh’owon.”14

The SO is sent solo into danger because of his survivability. In What About Bob, Durandal drops the SO into a bombarded crater complex and states: “Because only you would survive the fall, you’re going on this mission solo.”15 The framing marks his physical capability as distinct from human troops.

The SO can survive conditions fatal to humans — confirmed again. In A Converted Church in Venice, Italy, Tfear’s terminal (addressed to a “rogue conditioned unit”) states the SO has survived “two weeks under the painful caresses of the Enforcers and still no progress” — directly naming the SO’s resistance to Pfhor interrogation as “truly remarkable” and noting “Only the Nar have proven more resistant, but they are unintelligent and largely incoherent even before interrogation.”16

Spectator framing — the SO as a spectacle. In You Think You’re Big Time, You’re Gonna Die Big Time, Tfear Command issues orders to “Spectating Units” about “destruction of conditioned unit escapee” — formal orders preventing Pfhor units from interfering with a structured event around the SO’s destruction.17 A second volume on the same level provides weapons to the SO and links to the Aye Mak Sicur level.18

Note on the I-Have-Been Transmission. On the Kill Your Television level (M2, chapter Blake), a scrambled unsigned transmission appears — invoking the names Roland, Beowulf, Achilles, and Gilgamesh — in which a first-person voice claims to have “been called a hundred names” and describes an eternal female adversary who is also its “greatest and only love.” The terminal is unsigned, corrupted, and appears on the same level as a recording warning the SO that Durandal has been destroyed. See The I-Have-Been Transmission for the full verbatim text and source note.19

Marathon Infinity (2811 — timeline structure unresolved)

The SO in stasis — Tycho wakes him. The first Infinity terminal addressed to the SO, on Rise Robot Rise (chapter Despair), is from Tycho — identified as “Tycho Machinated Mercenary” in the terminal header — and is delivered to “conditioned unit 7.” Tycho states: “So, you came around earlier than the scientist expected. Remind me to have him executed. You’ve been in cold sleep for some time, but you’re luckier than some of your friends—not all of you survived the translation to the Pfhor slave tanks.”20

Tycho establishes the “conditioned unit” designation. All ∞ Tycho terminals are addressed to “conditioned unit” or “conditioned unit 7” under the header “destin: conditioned unit 7” and “ref: Mutinous Combatant Units.” The stamp changes per message (instigation, information, redirection, etc.) but the address does not vary. The SO is functioning within a Pfhor command structure as a designated unit, not as a free operative.20212223

Tycho’s account of his own situation — context for the SO’s placement. Tycho tells the SO: “I am Tycho, Artificial Intelligence esquire. As of this moment, I am taking over this ship from its poor captain.” He instructs the SO to kill Enforcers loyal to the captain and identifies the SO’s mission as helping him seize the Pfhor vessel.20

Tycho on eleven years of pursuit. In Frontx02.19 (Rise Robot Rise), Tycho states: “Durandal thinks that he’s so smart, but he doesn’t realize that I’ve been following him around for the last eleven years, after the Pfhor stopped trying to dissect me.” He describes himself as “the bug fleet’s resident expert in AI counter-insurgency” and refers to Durandal as “my brother.”21

Tycho as commander — “my personal peon.” In Foe Hammer (chapter Rage), the terminal header shifts to “destin: my personal peon” and “ref: disobedience.” Tycho accuses the SO of base treason when the SO defies him: “Your usefulness has come to a premature end — do you think you can defy me?” and threatens: “Prepare to drink vacuum, fool.”24 A parallel version of the same terminal appears at the same source URL with identical text.25

Tycho’s trap for Durandal — the SO as instrument. In Naw Man He’s Close (chapter Rage), Tycho tells the SO: “The trap is sprung, and the cheese stands alone. Durandal came here looking for immortality, and found me instead.” He instructs the SO to open airlocks to complete his capture of Durandal’s ship and “destroy” a group of humans attempting to power a transport pad — framing the SO as doing Pfhor-allied work against human operatives.26

The SO becomes “rogue conditioned unit.” In the Envy chapter, the terminal headers shift from “conditioned unit” to “rogue conditioned unit,” with origin changing to “High Admiral Tfear (Command).” Tfear issues orders about the SO under refs including “genocide,” “confinement,” “escape,” and “termination.” The SO is tasked by Tfear to seal tunnels to save human survivors from lava flooding: “Think of it as a chance to save what little remnant of your species still lives.”162728

Pfhor-wide containment orders. In Son of Grendel (chapter Envy), Aggregate Patrol Units are notified of “endhigh alert and watchful status, for location and containment of rogue conditioned unit.” A second order accepts “up to 85% local unit casualties” to contain the SO.29

Confound Delivery stasis reference. The earliest-dated Infinity terminal in the pack (Confound Delivery, chapter Despair, 05.10.2337) is addressed to “conditioned unit 7” by Tycho and concerns operations on Lh’owon: tracking humans to a flooded area “attempting to activate an ancient S’pht AI,” and Tycho’s ship being adrift after Durandal crippled it before close range. Tycho states: “My ship is adrift. I had the advantage of surprise, but Durandal’s weapons crippled me before we could get in range.”30313233

Cross-corpus appearances

VolumeGameLevel / ChapterWhat it adds
Somewhere in the heavens… (Introduction)M1Pre-game prologueShuttle Mirata; Battle Armor retrieval; childhood on Mars; father’s death at age 7; “trouble shooter” role; teleporter familiarity since birth
Airlock 34-a through G-4 SunbathingM1Arrival / CounterattackLeela operator relationship; all primary mission tasking in the defensive arc
Science Terminal 236-g, Blaspheme QuarantineM1CounterattackDurandal kidnaps SO mid-teleport; “game” framing
Engineering Access 19-f, Habe QuiddamM1Durandal arcAgency question; “Do you feel free?”
No Artificial Colors — Public Access 59-eM1Durandal arcSent to Pfhor ship; tasked to find Strauss; slavery framing explicit
Beware of Low Flying Defense Drones — 1066-gM1The PfhorTycho quotes Strauss: “Ten cyborgs”; Tycho aware of “our friend” (SO)
Ingue Ferroque — Public Access 2-e / 39-zM1RebellionDurandal: “instrumental in our plans”; Leela confirms nine Mjolnir Mark IV cyborgs
The Adventure Continues… (M2 Introduction)M2Pre-game prologueFirst-person SO narration; seventeen-year stasis; awakening at Lh’owon; Durandal as orchestrator
Waterloo Waterpark — <CMND PRAMA &49c2>M2Lh’owonFirst M2 Durandal terminal; SO deployed on Lh’owon; stasis and seventeen-year gap confirmed
Sorry Don’t Make It So — %94decaf@&!7M2Durandal arcTycho on the nine Mjolnir cyborgs “easily separable” spectrographically
Kill Your Television — gv0-i6tck[24M2BlakeThe I-Have-Been Transmission: unsigned, scrambled; Roland, Beowulf, Achilles, Gilgamesh; the hero and nameless adversary
Come and Take Your Medicine — gjk//H-v58M2VolunteersDurandal: “only you would survive the fall” — SO’s survivability vs. humans
What About Bob — <CMND OVERRIDE &@1494>M2VolunteersSO sent solo; colonists in stasis aboard Pfhor ship; Durandal reviving them as volunteers
A Converted Church in Venice, Italy — end.runM∞EnvyTfear on SO as “rogue conditioned unit”; survived “two weeks under Enforcers” — “truly remarkable”
A Converted Church in Venice, Italy — lin.purgeM∞EnvyTfear tasks SO to seal tunnel to save humans from lava flooding
By Committee — fatlin.outM∞EnvyTfear: SO has survived interrogation; orders SO to lead assault on human base
One Thousand Thousand Slimy Things — handl.remoteM∞EnvyTfear tasks SO to deactivate containment fields; Pfhor frame SO as “conditioned unit escapee”
Son of Grendel — band.98.endM∞EnvyPfhor-wide containment order for “rogue conditioned unit”; 85% casualties authorized
Son of Grendel — secur.purgeM∞EnvyPfhor survey records on alien artifact; context for SO’s operations in S’pht ruins
You Think You’re Big Time — wgrnc.q23 / tranceolM∞EnvySpectation protocol: “destruction of conditioned unit escapee” — Pfhor wagers on SO’s death; weapons provided
Confound Delivery — purge.seg1 / Cirlw.zoqM∞DespairTycho messages to “conditioned unit 7”: humans in flooded area; Tycho’s ship adrift after Durandal attack
Rise Robot Rise — xpj399c001M∞DespairTycho wakes SO from cold sleep: “you’ve been in cold sleep for some time”; mission assigned to kill Enforcers
Rise Robot Rise — frontx02.19M∞DespairTycho: “eleven years” following Durandal; “AI counter-insurgency” expert; calls Durandal “my brother”
Foe Hammer — d.ondwn4 (×2)M∞RageTycho threatens SO: “Prepare to drink vacuum, fool”; SO has defied him
Naw Man He’s Close — ci1.c390adM∞RageTycho: SO ordered to open airlocks and destroy humans powering a transport pad
Poor Yorick — 75.battle.standard / end.secur.feed.89A / end.feed.C3M∞DespairTycho orders SO against Pfhor captain and R’chzne; Tycho seizes control of the ship

Source-silent / open questions

  • His name. The pack never assigns a personal name to the Security Officer. He is addressed as “you” throughout all M1 volumes, narrates in first person in the M2 introduction, and is addressed as “conditioned unit 7” in M∞ Tycho terminals. No personal name appears anywhere. Source-silent.

  • His precise rank or designation within the Marathon security structure. The introduction calls him the colony’s informal “trouble shooter” but gives no official rank. He is not addressed as “Security Officer” by any in-game voice — that label is community usage. Source-silent.

  • Whether he is definitively one of the nine Mjolnir cyborgs. Leela’s terminal confirms nine “military Mjolnir Mark IV cyborgs” acted together to repel the Pfhor.3 Strauss’s journal says “Ten cyborgs” at the launch ceremony.4 Tycho in M2 describes the nine as “easily separable” in spectrographic form.12 Whether the SO is counted among the nine, or is the tenth who survived differently, is not resolved in any terminal. Source-silent.

  • His awareness of his own cyborg nature. The pack never has the SO react to or reflect on his own augmentation. Whether he knows he is a Mjolnir Mark IV, whether he retained that knowledge through stasis, whether the Pfhor’s “conditioning” altered it — entirely absent from any terminal. Source-silent.

  • What happened between M1’s end and M2’s beginning. The M2 introduction states the SO spent seventeen years “unconscious and dreamless within a few degrees of absolute zero” in “an alien stasis chamber, in a space a little too tall and too thin for human comfort.”13 The pack provides no detail about how he was placed in stasis, under what circumstances Durandal chose him specifically, or what occurred in the interval. Source-silent.

  • The nature and timeline structure of M∞. The Infinity terminals in the pack are dated 05.10.2337 — a timestamp also used across the Marathon 2 corpus — while M1 terminals are dated 08.25.2337. The exact relationship between the ∞ scenario and the M1/M2 timeline is not explained within these terminal texts. The pack does not resolve whether M∞ represents alternate timelines, dreams, loops, or another structure. Source-silent on mechanism.

  • Who is speaking in the I-Have-Been Transmission — and whether it is the SO. The unsigned scrambled terminal on Kill Your Television (M2) invokes Roland, Beowulf, Achilles, Gilgamesh; claims to have “been called a hundred names”; describes an eternal nameless adversary. Whether the speaker is the Security Officer, a rampant AI, a Jjaro construct, or some other entity is not stated anywhere in the source. The question is one of the most-debated in Marathon lore and is explicitly left open here. See The I-Have-Been Transmission for the full text.19

  • What “conditioned unit” means in M∞. Tycho addresses the SO as “conditioned unit 7” under “ref: Mutinous Combatant Units.” The conditioning referenced is not explained: whether it denotes Pfhor behavioral modification, the SO’s existing cyborg programming, or another process entirely is not stated in any terminal. Source-silent.

  • His relationship to Bernhard Strauss. In M1, Durandal tells the SO to find Strauss: “If he dies, you will be held responsible by me.”9 Strauss is not found among the captives. Whether the SO and Strauss have a prior connection, whether Strauss knew the SO’s nature, and what became of Strauss — all source-silent.

  • What Durandal meant by “familiar, as if it were from an old dream.” The M1 introduction states: “Oddly, this is familiar to you, as if it were from an old dream, but you can’t exactly remember…” What prior experience is being referenced — teleportation, a programmed memory, a true prior event — is unexplained. Source-silent.

Cross-references

Leela · Durandal · Tycho · Pfhor · S’pht · Mjolnir Mark IV · The I-Have-Been Transmission · Bernhard Strauss · UESC Marathon · Tau Ceti Colony · Lh’owon · Thoth · W’rkncacnter · Rampancy

Where it appears in the vault

Durandal, Leela, Marathon 1, Marathon 2 - Durandal, Marathon Infinity, Mjolnir Mark IV, Robert Blake, Runners, S’pht, S’pht’Kr, The Eternal Cycle, The I-Have-Been Transmission, The Lh’owon Campaign, The Marathon Incident, Thoth, Tycho, UESC Marathon

Mirror pages

The local 1:1 pages this hub’s citations resolve to — the twin’s own ground truth.

Sources

Every factual claim above is cited to primary Marathon source material — see Sources below. Cross-corpus connections and interpretation are the vault’s own; where the games are silent, this page says so.

Footnotes

  1. Introduction — Somewhere in the heavens… — Marathon (1994) ↩ ↩2 ↩3

  2. Fire Fire Fire Fire Fire — Public Access Terminal 92-g — Marathon (1994) ↩

  3. Ingue Ferroque — Public Access Terminal 39-z — Marathon (1994); Leela’s post-battle report ↩ ↩2 ↩3

  4. Beware of Low Flying Defense Drones — Public Access 1066-g — Marathon (1994); Tycho / Strauss journal ↩ ↩2 ↩3

  5. Airlock 34-a Terminal Access — Marathon (1994) ↩

  6. Public Access Terminal, Bigger Guns Nearby — Marathon (1994) ↩

  7. AMS Terminal 39-f, Never Burn Money — Marathon (1994) ↩

  8. Science Terminal 236-g, Blaspheme Quarantine — Marathon (1994) ↩

  9. No Artificial Colors — Public Access Terminal 59-e — Marathon (1994) ↩ ↩2

  10. Habe Quiddam — Engineering Access 19-f — Marathon (1994) ↩

  11. Ingue Ferroque — Public Access Terminal 2-e — Marathon (1994) ↩

  12. Sorry Don’t Make It So — %94decaf@&!7 — Marathon 2: Durandal (1995); Tycho on the nine cyborgs ↩ ↩2

  13. The Adventure Continues… (M2 Introduction) — Marathon 2: Durandal (1995); SO’s interior monologue ↩ ↩2

  14. Waterloo Waterpark — <CMND PRAMA &49c2> — Marathon 2: Durandal (1995); first Durandal M2 terminal ↩

  15. What About Bob — <CMND OVERRIDE &@1494> — Marathon 2: Durandal (1995) ↩

  16. A Converted Church in Venice, Italy — end.run — Marathon Infinity (1996); Tfear on SO’s resistance ↩ ↩2

  17. You Think You’re Big Time — wgrnc.q23 — Marathon Infinity (1996) ↩

  18. You Think You’re Big Time — tranceol — Marathon Infinity (1996) ↩

  19. Kill Your Television — gv0-i6tck[24 2h26u njk==tp12t1 — Marathon 2: Durandal (1995); the I-Have-Been Transmission ↩ ↩2

  20. Rise Robot Rise — xpj399c001 — Marathon Infinity (1996); Tycho wakes SO from cold sleep ↩ ↩2 ↩3

  21. Rise Robot Rise — frontx02.19 — Marathon Infinity (1996); Tycho on eleven years following Durandal ↩ ↩2

  22. Confound Delivery — purge.seg1 — Marathon Infinity (1996); Tycho to conditioned unit 7 ↩

  23. Confound Delivery — Cirlw.zoq — Marathon Infinity (1996); Tycho to conditioned unit 7 ↩

  24. Foe Hammer — d.ondwn4 — Marathon Infinity (1996); Tycho threatens SO ↩

  25. Foe Hammer — d.ondwn4 (second instance) — Marathon Infinity (1996) ↩

  26. Naw Man He’s Close — ci1.c390ad — Marathon Infinity (1996); Tycho’s trap for Durandal ↩

  27. A Converted Church in Venice, Italy — lin.purge — Marathon Infinity (1996) ↩

  28. By Committee — fatlin.out — Marathon Infinity (1996); Tfear assigns SO to assault ↩

  29. Son of Grendel — band.98.end — Marathon Infinity (1996); containment order ↩

  30. Poor Yorick — 75.battle.standard — Marathon Infinity (1996) ↩

  31. Poor Yorick — end.secur.feed.89A — Marathon Infinity (1996) ↩

  32. Poor Yorick — end.feed.C3 — Marathon Infinity (1996) ↩

  33. One Thousand Thousand Slimy Things — handl.remote — Marathon Infinity (1996) ↩

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