Alien (film)

Alien is a sci-fi movie from outside the Whoniverse. Toshiko Sato compared the body of a dead soldier with his heart ripped out to scenes and characters from the movie. (TW: Greeks Bearing Gifts)

The Doctor referenced this movie and its sequels whist imprisoned within Area 51. (DW: Dreamland)

Izzy Sinclair compared being chased by the Daleks and their Contagium to being "an extra in an aliens film". The Doctor wryly agrees (DWM: Fire and Brimstone)