On a primitive planet, the Monkeys find two aliens undergoing a rite of passage. One alien befriends the monkeys, the other joins a group trying to capture the Monkeys. An intervention shows that things aren't what they seem.
A chimp in a spaceship goes off course into the far edges of the universe. Aliens enhance his intelligence to make him Captain Simian, so he can defeat the evil Nebula, who wants to take over the universe.
The crew find a derelict ship, some crystals and an alien egg. The egg hatches with a quick-evolving alien that threatens the ship and crew. Splitzy uses the crystals to trap the alien and dump it into space.
Giant alien bananas attach to the ship, capturing some of the crew and making clones of them that take over the ship. The captain has to find the home origins of the bananas in order to free his crew and ship.