Ricky Ricotta and his Mighty Robot are in big trouble. After crashing the Ricotta family mini-van while using it as a skateboard, they have to earn some money quickly to pay for repairs. While they're thinking how on EARTH they are going to come up with the money...on Mars, mean Major Monkey is making plans to enslave mousekind! Major Monkey knows that the first thing he must do is get rid of that robot. Major Monkey tricks the robot into going to Mars. Now it's up to Ricky to rescue his robot and keep Major Monkey from menacing mankind. Ricky Ricotta tiene suerte de que su Poderoso Robot sea su mejor amigo. Juegan, estudian y hasta se meten en problemas juntos y siempre cuidan uno del otro. Para eso son los amigos! En este libro, Ricky y su Poderoso Robot conocen a un marciano pequeno pero cruel, el Almirante Mono, que planea apoderarse de la Tierra con sus monstruosos Meca Monos. Cuando el Almirante Mono le hace una mala jugada al Robot de Ricky, Ricky tiene que rescatar a su amigos y evitar que el Almirante Mono continue amenazando la vida de los ratones.