Object

Lennox's Isotope Canister

Lennox carries this portable canister of radioactive isotope into the isolation booth to deliver radiation to the alien-possessed astronaut clad in the Van Lyden suit. Reegan explains they feed the astronauts radiation to sustain their lives and amplify their lethal touch, which kills UNIT operatives instantly. The canister enables control over the creatures amid Liz Shaw's accusations and Lennox's reluctant admissions in the underground laboratory.

4 appearances

Purpose

Deliver radiation to sustain and control alien-possessed astronauts

Significance

Empowers Reegan's conspiracy by maintaining the astronauts' invincibility and assassin potential. Lennox transports it, exposing his complicity as Liz demands he defy Reegan, heightening isolation and betrayal in the lab.

Appearances in the Narrative

When this object appears and how it's used

4 moments

S7E15 · The Ambassadors of Death Part 4

Lennox’s reluctant complicity in Liz’s escape

The isotope canister, carried by Lennox into the isolation chamber, is the scene’s ticking clock. Its lethal radiation is both a weapon and a sacrifice—Lennox uses it to create a distraction, knowing the canister’s breach will draw attention and buy Liz time. The canister’s glow casts eerie shadows on the chamber walls as Lennox locks the door behind him, its contents a silent judge of his complicity. Symbolically, it represents the irreversible consequences of Reegan’s experiments, a physical manifestation of the moral decay consuming the laboratory. Its presence ensures no one will follow Liz; its absence from the main lab is a void filled by urgency and dread.

Before: Stored in the underground laboratory, likely in a secured container near the isolation chamber. Lennox retrieves it as part of his plan, its transfer marking the escalation of the scene’s stakes.

After: Sealed inside the isolation chamber with Lennox, its radiation now a death sentence. The canister’s breach is imminent, its glow the last light Lennox will see.

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S7E15 · The Ambassadors of Death Part 4

Lennox’s Sacrificial Isolation

The isotope canister is the lethal centerpiece of Lennox’s sacrifice. He carries it into the isolation chamber, where its contents—highly radioactive and primed for breach—become the distraction that allows Liz to escape. The canister is both a scientific tool and a weapon, its dual nature reflecting the moral corruption of the laboratory. Lennox’s decision to lock himself inside with it is an act of defiance, turning the conspiracy’s own tools against it. The canister’s glow, visible through the chamber’s glass, becomes a visual metaphor for the inescapable consequences of the laboratory’s experiments.

Before: Stored in the laboratory, likely among other hazardous materials. Before this event, it is one of several canisters used in the conspiracy’s experiments, its destructive potential latent until Lennox repurposes it for his final act.

After: Sealed inside the isolation chamber with Lennox, the canister’s contents are released, triggering a radiation breach. It transitions from a tool of the conspiracy to the instrument of Lennox’s death, its activation a literal and symbolic explosion of the moral compromises made within the laboratory.

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S7E16 · The Ambassadors of Death Part 5

Reegan reveals astronauts' lethal role

Lennox’s isotope canister is the literal and symbolic lifeline of the alien astronauts—and thus, Reegan’s power. When Lennox brings it into the isolation booth, it’s a silent acknowledgment of his complicity: he’s not just a scientist, but an enabler. Reegan’s boast about ‘feeding them radiation’ frames the canister as both a tool of control and a ticking clock. Its presence in the scene is a grim detail—Liz’s disgust at the ‘murderer’ she’s working for is amplified by the canister’s role in sustaining the killers. The object is a physical representation of the moral compromise at the heart of the lab.

Before: Full and functional, carried by Lennox into the isolation booth. Its contents are critical to the astronauts’ survival and lethality.

After: Used to revive the collapsed astronaut, its radiation now depleted or transferred. The canister’s role is cyclical: it sustains the weapon, but also highlights the fragility of Reegan’s control—without it, the astronauts would die.

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S7E16 · The Ambassadors of Death Part 5

Liz exposes Lennox’s complicity and tests his loyalty

The isotope canister, carried by Lennox, is the literal and symbolic tool of Reegan’s control over the astronauts. Its use to feed radiation to the creatures sustains their lethal touch, making them weapons. Liz’s accusation that Lennox is 'just as guilty' as Reegan hinges on his role in handling the canister, tying him to the deaths of UNIT personnel. The canister’s presence in Lennox’s hands during the confrontation underscores his complicity and the lab’s morally corrupt operations.

Before: Full and functional, used by Lennox to feed radiation to the astronaut in the isolation booth.

After: Partially depleted, still in Lennox’s possession but now a point of moral contention in Liz’s interrogation.

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