TRA-LA-LAA! The fourth CAPTAIN UNDERPANTS adventure, now in colour for the very first time! Professor Pippy P. Poopypants is a brilliant scientist, but his ridiculous name means no one takes his inventions seriously. Now he's armed with fiendish inventions Shrinky-Pig 2000 and the terrible Gerbil Jogger 2000. Can Captain Underpants stop him?