Cosmos 1, an interstellar spacecraft, is heading to its home base after a long mission when it receives a distress call from its sister ship, Cosmos 3. Some of the ship's Centaurian crew -- members of a once proud race who are now subservient to humans from the fleet's home world -- have rebelled. Cosmos 3 crashes on Solarius, an unexplored planet in a young star system, leaving behind five survivors, among them the Lt. Anderson and Zenda, human/Centaurian couple. The Cosmos 1, under the command of Admiral King (
Wendell Corey), makes the three month journey to Solarius at the speed of light, during which, because of the time paradoxes involved in light-speed travel, 18 years elapse on the planet. A landing party led by First Officer Scott (Keith Larson) begins searching for the wrecked ship and any survivors, and discover that this is a tropical world, beautiful and dangerous, filled with exotic birds and flowers, huge lizards and snakes, deadly insects and other animals, and crystaline pools and boiling pits. Meanwhile, Linda (Irene Tsu), a young Centaurian from Cosmos 1, gets lost in the jungle and is rescued by Tang (
Robert Ito), a young man living in the primordial forests -- she discovers that he is a Centaurian and the son of Anderson and Zenda. The two are attracted to each other, even as the crew of the Cosmos 1 is trying to rescue her and keep themselves alive. A conveniently timed volcanic eruption forces the issue of how far the admiral can carry this mission. ~ Bruce Eder, All Movie Guide