Krynoid Defoliant Spray Unit

A portable pressure-spray device resembling a heavy-duty firefighter's extinguisher, its metallic cylinder banded with heat-warped paint and a large brass control head. Used by the Doctor and Henderson during a greenhouse breach mission, its flexible hose ends in a fan-spray nozzle that vents an acrid white cloud when activated. This chemical mist neutralizes Krynoid vines on contact—exposing hidden individuals like Sarah and Scorby while causing adjacent vegetation to twitch and develop iridescent toxicity. The unit is repurposed agricultural equipment distinguished by its brominated residue and makeshift functional markings.

2 appearances

Purpose

To chemically neutralize aggressive plant matter, specifically targeting and killing Krynoid vines to create safe passages in otherwise impassable vegetation.

Significance

Critical tool of last resort in the rescue operation. Its rapid effectiveness saves lives but also condemns Hargreaves to the greenhouse’s writhing mass. Represents humanity’s thin technological edge against the unstoppable Krynoid infestation.

Appearances in the Narrative

When this object appears and how it's used

2 moments

S13E25 · The Seeds of Doom Part 5

Doctor and Henderson rescue Sarah and Scorby

The spray unit with a fan-spray nozzle is not explicitly described in this scene but the presence of spraying equipment and bottles implies its functional role was active. Henderson likely supports the unit while the Doctor handles the bottles, enabling rapid plant neutralization.

Before: Assembled and functional, carried by the Doctor and Henderson during their approach.

After: Used extensively during the rescue, venting acrid chemical clouds that wilt vines on contact.

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S13E25 · The Seeds of Doom Part 5

Hargreaves sacrifices himself in Krynoid retreat

The Krynoid Defoliant Spray Unit is deployed by the Doctor and Henderson within the greenhouse, its acrid white cloud immediately wilting the suffocating Krynoid vines on contact. The Doctor uses it to clear foliage trapping Sarah, exposing her and allowing her liberation before the wider evacuation.

Before: Intact and functional, carried by the Doctor and Henderson from the greenhouse exterior to the interior breach point

After: Partially depleted but still operational after multiple discharges, left behind as the team evacuates

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