"The Green Slime" (1968) tells the story of a group of scientists who bring back a strange green substance from an asteroid they destroyed, only to discover it has mutated into a dangerous monster. Directed by Kinji Fukasaku and written by Ivan Reiner, Charles Sinclair and Bill Finger, the stellar cast includes Robert Horton, Luciana Paluzzi, and Richard Jaeckel. With fantastic special effects and a thrilling story, it's a classic sci-fi horror not to be missed.