The wait is over! All-new adventure from the much-loved, million-selling author of Captain Underpants Dav Pilkey. Ook and Gluk have a pretty awesome life growing up together in Caveland, Ohio, in 500,001 BC - even though they're always getting in trouble with their nasty leader, Big Chief Goppernopper. But Ook and Gluk's idyllic life takes a turn for the terrible when an evil corporation from the future invades their quiet town...

See Ook and Gluk here.