Forbidden Planet is a classic science fiction film that dives deep into the realm of the subconscious. The plot is based on William Sahkespear's the Tempest.
The monster that attacks Luke Skywalker and his ton-ton at the beginning of The Empire Strikes Back is called a Wampa. It inhabits ice caves in the Hoth system.
The classic film, The Empire Strikes Back, is the second installment in the original Star Wars trilogy, written by George Lucas and directed by Irvin Kershner.
John Carpenter's The Thing was an alien film made in 1982. The film was underlooked due to a more friendly film called ET, which released around the same time.