When Phineas and Ferb find out that their grandma used to be a roller derby queen. Soon they discover that Jeremy Johnson's grandma also used to be a skating champ, and they set up a contest to see which granny can roller derby their way to the finish line the fastest.

Daredevil Days 2010, Disney Press, New York, NY

ISBN-13: 9781423127406

Trade paperback

Daredevil Days 2010, Turtleback Books, New York, NY

ISBN-13: 9780606148610

Turtleback School & Library edition