Neurotoxin

Neurotoxin is an option in Fleeing the Complex seen in "The Betrayed" pathway.

After Henry Stickmin has called the Toppat Clan to bust him out of The Wall, the Toppats can fire a neurotoxin grenade into The Wall's cafeteria. However, the they neglected Henry's presence. The Neurotoxin degrades everyone into mindless zombies and renders a rescue meaningless, resulting in a fail.

Fail Message
Oh, did they forget to hand out your gas mask beforehand?

Trivia

 * Neurotoxins are real-life chemical archetypes known for causing neural tissue damage.
 * Its effects in-game may refer to how Zombies are organisms with heavily deteriorated brain functions.