The X-Files: 5x19
Folie à 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 by one, which is disbelieved until Mulder opens his mind and allows himself to see it too.
5 - 1Redux (2) Nov. 02, 1997
5 - 2Redux II (3) Nov. 09, 1997
5 - 3Unusual Suspects Nov. 16, 1997
5 - 4Detour Nov. 23, 1997
5 - 5The Post-Modern Prometheus Nov. 30, 1997
5 - 6Christmas Carol (1) Dec. 07, 1997
5 - 7Emily (2) Dec. 14, 1997
5 - 8Kitsunegari Jan. 04, 1998
5 - 9Schizogeny Jan. 11, 1998
5 - 10Chinga Feb. 08, 1998
5 - 11Kill Switch Feb. 15, 1998
5 - 12Bad Blood Feb. 22, 1998
5 - 13Patient X (1) Mar. 01, 1998
5 - 14The Red and the Black (2) Mar. 08, 1998
5 - 15Travelers Mar. 29, 1998
5 - 16Mind’s Eye Apr. 19, 1998
5 - 17All Souls Apr. 26, 1998
5 - 18The Pine Bluff Variant May. 03, 1998
5 - 19Folie à Deux May. 10, 1998
5 - 20The End May. 17, 1998