Johnny meets the Scooby-Doo gang when his car breaks down before he gets to his aunt's house and when he gets to the house Johnny and the Scooby-Doo gang have to find his aunt.

A robber robs Mr.Goodman, the karate teacher and Johnny helps him and the robber is pretending to be giving him a test for the next belt level.

Johnny keeps seeing this clown, who is there to balance the wing and Johnny tries to get rid of the clown.

Johnny and Suzy all of a sudden find Jungle Boy at the circus under the control of an evil beautiful ringmaster and must save him before it's too late!