Dr Mu's latest hair-brained plan is to invade the Earth using pizza. He's harvesting the resources of planet Pizzeria in this latest evil quest, and as ever, Rufus must stop him before it's too late...

Dr Mu's latest hair-brained plan is to invade the Earth using pizza. Harvesting the cheese mountains, giant tomatoes and olive groves of Princess Gelina's homeworld, Dr Mu has built up the biggest pizza chain in the multiverse. And with his profits he is constructing a giant, pizza-shaped starship capable of destroying whole worlds - the Death Pizza.

When Rufus lands on the planet Pizzeria he discovers a mysterious message from Princess Gelina for a rebel leader called Buck, who is leading the Pizzerian rebellion against the evil doctor and his army of Pizza-Troopers. Together, Rufus and Buck set out to rescue the Princess and destroy the Death Pizza before it - and Dr Mu - destroy the Earth.