The All-New Captain Underpants Extra-Crunchy Book o' Fun 2 is a book that was released in 2002.
Apparentley, it has Super Diaper Baby and Diaper Dog on the front cover.
This book features an all-new comic: "Night of the Terror of the Revenge of the Curse of the Bride of Hairy Potty."
Also, after you read the comic you see a coming soon comic based on Hairy Potty and Mrs. Potty's son. This comic may be in another possible Book O' Fun.