Captain Underpants and the tyrannical retaliation of the Turbo Toilet 2000 : the eleventh epic novel / by Dav Pilkey.

The truth, the whole truth, and nothing but the truth about Captain Underpants
George and Harold
Don't you hate it when a kickball hits Uranus?
Melvin's moment of mirth
He-who-must-not-be-flushed
Big Melvin returns
Sanitized for your protection
The incredibly graphic violence chapter, part 1 (in Flip-O-Rama)
Everybody loves Melvin
With great power comes a great big pain in the hiney
It's a mad, mad, mad, mad Melvin
Dark foreshadows
Headin' home
Eleven minutes later
What was to come next
To thine own self be truant
Super-secret test day
The idea
Our doppel gäng
The pact
Shift workers
Problems
Super Diaper Baby 2 1/2
Dream a little dream of us
Twin pranks
Twelve days of chaos
Heeeeeeeeere's Johnny!
Disguise crazy!
One smashed into the cuckoo's nest
The incredibly graphic violence chapter, part 2 (in Flip-O-Rama)
Tears of a commode
The re-retaliation
Surprise, surprise, surprise!
To make a long story short
Welcome back, Krupp
Hamsterdactyls
All's well that ends poorly.