School boy friends Harold and George love creating comic book stories and playing pranks on their teachers. Their nemesis, Head Teacher Mr. Krupp intends on spoiling their fun however and separating them at school. In a last-ditch effort to stop him, the boys hypnotise him into thinking he is their favourite comic creation, Captain Underpants!

Whilst having a fairly fun and round animated style and a few novel ideas to mix up the story telling (using the boys comics and addressing the camera directly whilst the action is frozen) this is not a film aimed anywhere else but the young members of the audience. The humour is rooted in farts and toilets and a grown man wearing pants after all.

As far as the youngsters are concerned though, there is a lot of fun to be had in some pratfalls and toilet humour.