The Phantom Planet

"In this off-beat sci-fi adventure an astronaut must make a forced landing upon a remote asteroid. His ship is damaged and he must breathe the planet's atmosphere. Soon he begins shrinking and once he gets down to six inches discovers the place populated by diminutive people who have turned the flying rock into a ship. He soon joins forces with the little people to defeat the monstrous solarites, terrifying creatures out to eat them. The leader of the wee-folk is Francis X. Bushman who was once a popular romantic lead in silent movies."