Aero decides to keep a new pet that Tumble brings to the circus. A lion cub named: Simba was taken care of in the circus but as Simba gets older, he becomes too dangerous to the audience so Aero and Tumble have to get rid of the lion and send him back to the wild. Ektor plans to use the lion to kill Aero and his friends. Soon after the lion reaches the wild, Ektor kidnaps it and Tumble notices that the lion has been trapped. He tries to warn Aero but he is also captured by Ektor's clowns.
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