Rufus faces a familiar-looking enemy as he tries to prevent Dr. Mu from taking over the multiverse. All he has to do is negotiate three chambers containing his deepest, darkest fears, battle a giant broccoli monster, defeat his evil clone, destroy Dr. Muhahaha's cloning device and prevent him from hitting his time-reversing reset button. Just another day for the hapless TV presenter.

Everyone on Earth has suddenly developed really bad breath and Dr. Mu is, of course, to blame. Rufus is transported to a junk asteroid made entirely from rubbish, the Planet Flotsam, where Dr. Mu is extracting the powerful Grot Particle and beaming it across the universe to Earth. Can Rufus stop Dr. Mu before the epidemic of eggy breath reaches toxic levels and the whole planet has to be evacuated?

Desperate to impress his arch-enemy and old school friend Dr. Wu, Dr. Mu decides to steal the sun, using a giant intergalactic space wormhole, a plan that threatens to leave the Earth quite literally out in the cold. Can Rufus save the world from its icy fate? And how on earth is a tin of cat food from his future self ever going to help anybody?