Stuart Pankin

Earl Sinclair

Allan Trautman

Fran Sinclair, Fran Sinclair (face), Mr. Pulman

Jessica Walter

Fran Sinclair

Leif Tilden

Robbie Sinclair, Robbie Sinclair (body), Muse

Jason Willinger

Robbie Sinclair

Bruce Lanoil

Charlene Sinclair, Charlene Sinclair (face), Larry

John Kennedy

Baby Sinclair, Baby Sinclair (eyes), Bryant

Kevin Clash

Baby Sinclair, Howard Handupme, Grandma Ethyl Phillips

Bill Barretta

Earl Sinclair, Earl Sinclair (body), Rabid Caveman

Sally Struthers

Charlene Sinclair

David Greenaway

Roy Hess, Spike, Grandma Ethyl Phillips

Michelan Sisti

Charlene Sinclair, Charlene Sinclair (body), Mr. Ugh

Tom Fisher

Additional Dinosaur Performer, Earl Sinclair, Pearl Sinclair

Pons Maar

Roy Hess, Additional Dinosaur Performer, Fran Sinclair

Jack Tate

Additional Dinosaur Performer, Bob, The Job Wizard

Steve Whitmire

Robbie Sinclair, B.P. Richfield, Robbie Sinclair (face)

Mak Wilson

Earl Sinclair, Guy in the Lab Coat, Chief Elder

Tony Sabin Prince

Fran Sinclair, Les