Bumageddon, by Andy Griffiths

Not only had Zack just arrived back on Earth after saving the world from a zombie bum invasion and rescuing his parents from Uranus, but he had also graduated from Silas Sterne’s Bum-fighting Academy. In one hand he proudly held his basic bum-fighter’s certificate, and in the other a special medal of excellence for his work in the bum-fighting simulator.
Unfortunately, however, none of the challenges Zack had faced so far – either real or simulated – had prepared him for giant-brown-blobbification.

Young readers first met Zack in The Day My My Bum Went Psycho and continued following his adventures in Zombie Bums From Uranus. Now, in the final instalment of the trilogy, Zack is back, fighting giant white bums as they attempt to take over the world. In an adventure packed with bums, smells and silly puns, there are also robots, romance, time travel and masses of brown stuff.

In this gripping conclusion Zack, his bum and his friend Eleanor tackle the dreaded white bums in a final conflict just as bizarre and funny as the earlier instalments. Of course, most adult readers won’t find these books as hilarious as primary aged children will – but they aren’t aimed at adults. If you don’t like it, don’t read it. But if you liked the first two books, you won’t be disappointed with this one.

Bumageddon: The Final Pongflict, by Andy Griffiths
Pan, 2005