Season 5 Episode 19 - Folie a Deux 

Mulder is held hostage inside an office where a man claims his boss is a monster and has clouded all their minds while he turns them into zombies one سے طرف کی one, which is disbelieved until Mulder opens his mind and allows himself to see it too.
الفاظ مطلوبہ: x-files, mulder, scully, full episode, season 5, episode 19, folie a deux, 5x19