Fart club: Yuck has had a brilliant idea for a club and he's inviting all his friends - who would have thought there were so many types of farts?

But his sister, Polly, is determined to find out what Yuck and his friends are up to in the treehouse and she's in for a big shock when she finds out!

Sick Trick: Yuck does not want to go to school. He's got a spelling test and he'll do anything to get out of it.

Even if it means showing the whole family just how sick he really is...