Thundercrack!

Marion Eaton

Mrs. Gert Hammond

George Kuchar

Bing / Medusa

Melinda McDowell

Sash

Phillip Heffernan

Chandler Wilson (as Mookie Blodgett)

Moira Benson

Roo

Rick Johnson

Toydy McNeil

Maggie Pyle

Willene Cassidy

Ken Scudder

Bond

Curt McDowell

Medusa / Gerald Hammond (as Pamela Primate)

Bernie Boyle

Señor Tostada

Mark Ellinger

Charlie Hammond

Virginia Giritlian

Sarah Lou Phillips

Michelle Gross

Hula Hoop Girl

Laurie Hendricks

Simon Cassidy's Mother

Billy Paradise

Mrs. Harlan