Captain Underpants: Two Wedgie-Powered Novels in One (Books 1 & 2)

Two Captain Underpants adventures now in full colour!
George and Harold have created the greatest superhero in the history of their school — and now they're about to bring him to life!
MEET CAPTAIN UNDERPANTS!
His true identity is so secret, even he doesn't know who he is!
Fighting for truth, justice and all things pre-shrunk and cottony!

Captain Underpants 1: The Adventures of Captain Underpants.

Captain Underpants 2: Captain Underpants and the Attack of the Talking Toilets.