Robo Story follows the adventures of a small, orange-haired girl called Myrtille and her dog Loufi. In the opening title sequence we see Myrtille chase the mischievous Loufi onto a space shuttle that takes off with her inside. The ship crash lands on a world known as the Green Planet.
The Green Planet is inhabited by robots. In the original French version these were the evil Rotors, and the friendly Robors. English language versions changed this slightly, renaming the evil robots the 'Wrigglers', and the friendly robots the 'Robos'.