👉 Unclimbable is a 1963 American science fiction film directed by Ray Harryhausen and produced by Universal Studios. It stars Peter Sellers as an astronaut who is stranded on a planet where everything falls apart. The film follows the crew's search for a way to communicate with Earth, which leads them to the planet's "Unclimbable" surface. The film features some of the most iconic creatures in science fiction cinema, including the giant octopus and the flying insectoid.