Caldecott Medalist, National Book Award Winner, and New York Times bestselling creator Dan Santat returns to Sidekicks! This expanded edition includes a brand-new cover and sixteen pages of a never-before-seen epilogue! Suit up for high-octane action and laughs!

Captain Amazing is searching for a sidekick!

Captain Amazing, the hometown hero of Metro City, is so busy catching criminals that he rarely has time for his pets -- he hasn't even noticed they've been developing superpowers of their own!

So when he announces that he needs a sidekick, his eager pets -- a dog, a cat, a hamster, and a chameleon -- all decide to audition for the part and a chance for some one-on-one time with the Captain.

But Dr. Havoc, Captain Amazing's longtime nemesis, is hatching up an evil scheme, and the Captain is in serious trouble. Can the warring pets put their squabbles aside to save Captain Amazing and Metro City?