It's tough to be Zeke.

He's got his hands full with his prissy, know-it-all sister; his mean cousin Caitlyn, who's house-sitting for his missing parents; and a bully making life tough at school. And now, thanks to a stinky, scruffy, good-for-nothing talking cat, he's also got to cope with zombies, midget freedom fighters, devious spies, superstar rappers, and a whole weird world beneath our own where people wear their underwear on the outside of their clothes.

Stephanie has a whole underwear drawer full of trouble.

A week ago, Stephanie's biggest problem was finding enough time to complete her homework and study for her Mathletes competitions. Now she has to deal with magical toilet brushes, sinister talking cats, nearsighted sea serpents, feminist pirates, runty freedom fighters, and all the cottony white weirdness of Underwhere--the world beneath our own where people wear their undies on the outside of their clothes.

Sometimes even sidekicks have to step up.

Zeke's busy being the so-called Prince of Underwhere. His prissy sister, Stephanie, is some sort of pirate queen. But Hector? He's just a sidekick. Well, those days are over. Now only Hector can save the day--if he can survive swarms of sharp-beaked midget dinos, smart-aleck flying horses, angry armies in their undies, a really, really bad hypnotist, and a duel with deadly toilet plungers. . . all the ordinary wedgie weirdness of the tighty-whitie world under our own.