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Buck Buckerson (voiced by Billy Ray Cyrus) is a monster truck rally champion, who only appeared in the episode "It's a Mud, Mud, Mud, Mud World." When Candace needed to learn how to parallel park, Phineas and Ferb built a mud track in their backyard for her to practice, bringing Buck along with them to challenge her. At the end, Candace won the parallel parking challenge, in spite of Buck's driving skills. Buck bought the mud track when Phineas said they didn't need it anymore.
