The Green Slime (1968)

Directed by Kinji Fukasaku. The story is set in space and follows a team of astronauts who must confront an extraterrestrial menace: a rapidly multiplying and highly destructive form of alien life known as "green slime." The astronauts, led by Commander Jack Rankin (played by Robert Horton), face escalating danger as they attempt to contain and eradicate the green slime before it threatens Earth.