The Vervoid species' relentless bio-invasive expansion through the ship's infrastructure, driven by a singular directive to consume organic matter and eliminate human threats

A guard investigating a metal grill in a corridor is ambushed by two Vervoids, one emerging from the vent as the other stabs his neck, dropping him with his communicator …

The Doctor infiltrates the Vervoids' lair and uncovers the murderous plants in a moment of cold calculation. Two Vervoids discuss the rising tally of corpses from their systematic hunt, marking …