The following movies/television shows are listed in the Horror, Monster genre.
Alien (1979)
Alien 3 (1992)
Alien: Resurrection (1997)
Aliens (1986)
Basket Case (1982)
Creepozoids (1987)
It Waits (2005)
The Relic (1997)
Troll (1986)
Troll 2 (1990)