NASA is preparing for its first manned mission to Mars. Benjy, Elicia, Rio, Murray the Martian and Sir Ralph are in charge of producing the astronauts food for the journey. Mopsworth Custard is on every menu, in fact Mopsworth Custard is critical to NASA'a whole trip to Mars. All is going well until an accident with a cowpat sees Benjy, Elicia, Rio, Murray and Sir Ralph fly off to Mars. How will they get back to Earth? But the most important question...what will Benjy, Elicia, Rio and Sir Ralph find on Mars? The journey to Mars is full of fun for the young astronauts. But not for the people back at NASA. They are pulling their hair out. On Mars, is when the fun really begins. If the young astronauts are to return to Earth, Benjy must learn to ride a camel. Elicia must to learn how throw a javelin. Rio must to learn how use rocket boots. And Sir Ralph, the Queen of England's corgi must learn how to become a TV cameraman. If not they will never get back to Earth.