Thunder is Jockey Pablo's racing horse. He follows all of Pablo's orders, even when they decrease his chances of winning a race. Thunder races against Lightning in "Horsing Around".
Looks
Thunder is mostly dark brown, with a black mane and black hooves. He wears white bandage-like wraps around his legs a blue and yellow head mask and a blue and yellow blanket his saddle brown and his bridle is also with gold and silver buckles and clips.
Appearances
Thunder has appeared in one episode of The Backyardigans: "Horsing Around" from season two.