A boy of the Universal Peace Corps from the planet Radion lands on Earth to fight against criminals and extraterrestrial villains such as the Martian magician of Mars Warlock, and Krag of Kragmire.

    The normal Earth boy called Bobby, transforms into Prince Planet from his pendant whenever energy is received from Radion.

    He teams up with his friends such as Diana Worthy, Dan Dynamo, and Ajibaba.