Katherine's Rival

The second Season 37 book release. Once again, this book is a chapter book. The book is about Katherine and Doofenshmirtz's rivalry. Bonus features return in this book.

Episodes Included

 * Katherine v.s. Doofenshmirtz
 * Believe In Myself

Bonus Features

 * Fun games for kids
 * Bonus story: Back to Canada
 * DVD Sampler of the episode Buford's Hit Single