Directed by Bruce Bilson Written by Michael Jacobs   Bob Young   Victor Fresco   Jim Henson   Cast Mak Wilson ... Earl Sinclair Tom Fisher ... Earl Sinclair Stuart Pankin ... Earl Sinclair (voice) Tony Sabin Prince ... Fran Sinclair Jessica Walter ... Fran Sinclair (voice) Steve Whitmire ... Robbie Sinclair / B.P. Richfield Leif Tilden ... Robbie Sinclair Jason Willinger ... Robbie Sinclair (voice) Bruce Lanoil ... Charlene Sinclair Michelan Sisti ... Charlene Sinclair Sally Struthers ... Charlene Sinclair (voice) Pons Maar ... Roy Hess Sam McMurray ... Roy Hess (voice) Brian Henson ... Grandma Ethyl Phillips David Greenaway ... Grandma Ethyl Phillips / Roy Hess Florence Stanley ... Grandma Ethyl Phillips (voice) Sherman Hemsley ... B.P. Richfield (voice) John Kennedy ... Baby Sinclair / Richard Kevin Clash ... Baby Sinclair / Grandma Ethyl Phillips (voice) Jack Tate ... Richard Thom Sharp ... Richard (voice) Julianne Buescher ... Additional Dinosaur Performer Kevin Carlson ... Additional Dinosaur Performer Star Townsend ... Additional Dinosaur Performer (as Star Townshend) Allan Trautman ... Hank (voice) Uncredited Cast Michael Dorn ... WeSaySoCorp Announcer Produced by Mark Brull   Michael Jacobs   Jeff McCracken   Rob Ulin   Original Music by Ray Colcord

Additional Info Premiere: December 11, 1991 DVD Release: May 02, 2006 Country: Distributor: Buena Vista Home Entertainment Websites: Production Companies Jim Henson Productions Michael Jacobs Productions The Jim Henson Company Walt Disney Television Distributors ABC Signature   (2016) (USA) (DVD) American Broadcasting Company (ABC)   (1991-1994) (USA) (TV) Disney Channel   (1995-2000) (USA) (TV) Disney+   (2021) (USA) (video) (VOD) Disney-ABC Domestic Television   (1991) (USA) (TV) Rating Stats Overall Rating -- / 10 Our Rating -- / 10 Your Friends -- / 10 Male Users -- / 10 Female Users -- / 10 Site Ranking #3,484 / 20,886 Site Ranking