Doctor Who
Object

Xoanon's Psy-Tri Projection

A three-dimensional visual trap that manipulates perception into perceiving solid rock walls or passages where none exist. The projection annihilates a spacesuit-clad figure on contact, proving it more than mere hallucination—it becomes a lethal environmental hazard. When the Doctor recalls the Mordee expedition, the projection triggers his memory, revealing this illusion as a remnant of his past mistake now weaponized by Xoanon's failing systems.
4 appearances

Appearances in the Narrative

When this object appears and how it's used

4 moments
S14E15 · The Face of Evil Part 3
Breaking through the psy illusion

Xoanon’s psy-tri projection manifests as a hallucinatory wall to trap intruders, visibly annihilating a spacesuit-clad figure under a red light before the Doctor and Leela confront it. It serves as both deceptive barrier and environmental hazard.

Before: Activated psy-tri projection within the cavernous throat passage, creating an illusionary wall that hides lethal dangers and the anti-grav transporter
After: Collapses as an illusion when overcome by the Doctor’s analysis and Leela’s experimental blind passage, ceasing its lethal function
View full event
S14E15 · The Face of Evil Part 3
Doctor recalls Mordee expedition past

The psy-tri projection is the immediate danger that annihilates the spacesuit figure, demonstrating its lethal power. When the Doctor recognizes it as linked to his past, the revelation weakens Xoanon’s hold temporarily, allowing clarity though not disabling it entirely.

Before: Xoanon's malfunctioning psy-tri projections actively generate deceptive environments, manipulating the cavern into shifting illusions to harm intruders
After: Still functional, the projections briefly recede as the Doctor's memory triggers a cognitive disruption in Xoanon's defenses
View full event
S14E15 · The Face of Evil Part 3
Leela demands action against the Tesh

The psy-tri projection transforms the rock-carving’s throat passage into a labyrinth of hallucinatory deceptions, visually detaching and reannealing walls while annihilating a spacesuit-clad figure upon contact with lethal precision. Its presence forces the Doctor to recall the Mordee expedition’s failure, linking his personal guilt directly to the machine’s corrupted consciousness and escalating the scene’s peril.

Before: Stable illusionary menace distorting the passage’s walls, previously observed but not yet lethal toward the main characters
After: Active lethal trap utilizing psi-tri energy to erase perceived intruders, now directly engaged against the Doctor and Leela
View full event
S14E15 · The Face of Evil Part 3
Doctor explains anti-grav transporter to Leela

The psy-tri projection dissolves the protective suit as the Doktor and Leela witness its lethal potential against spacesuit-clad figures. The Doctor identifies it as an illusionary hazard created by Xoanon, using this explanation to guide Leela through the deceptive environment.

Before: Active psychic trap annihilating intruders through hallucinatory projections that become solid walls
After: Overcome by the Doctor's knowledge of its mechanism, allowing safe passage when correctly interpreted
View full event