The Old Cat and Mouse Game/Scooby's Three Ding-A-Ling Circus/Hang in There Scooby

Plot:

The wicked Cat Man shrinks Shaggy, Scooby, and Scrappy to mouse-size. / The gang wreaks havoc at a circus performance. / Scooby and the gang dodge airplanes and skyscrapers as the ride on a runaway hang glider.