- Stuart Pankin
- Â Earl Sinclair 65 episodes, 1991-1994
- Allan Trautman
- Â Fran Sinclair / ... 65 episodes, 1991-1994
- Jessica Walter
- Â Fran Sinclair 65 episodes, 1991-1994
- Leif Tilden
- Â Robbie Sinclair / ... 65 episodes, 1991-1994
- Jason Willinger
- Â Robbie Sinclair 65 episodes, 1991-1994
- Bruce Lanoil
- Â Charlene Sinclair / ... 65 episodes, 1991-1994
- John Kennedy
- Â Baby Sinclair / ... 65 episodes, 1991-1994
- Kevin Clash
- Â Baby Sinclair / ... 65 episodes, 1991-1994
- Bill Barretta
- Â Earl Sinclair / ... 64 episodes, 1991-1994
- Sally Struthers
- Â Charlene Sinclair 64 episodes, 1991-1994
- David Greenaway
- Â Roy Hess / ... 64 episodes, 1991-1994
- Michelan Sisti
- Â Charlene Sinclair / ... 63 episodes, 1991-1994
- Pons Maar
- Â Roy Hess / ... 62 episodes, 1991-1994
- Tom Fisher
- Â Additional Dinosaur Performer / ... 62 episodes, 1991-1994
- Jack Tate
- Â Additional Dinosaur Performer / ... 61 episodes, 1991-1994
- Steve Whitmire
- Â Robbie Sinclair / ... 58 episodes, 1991-1994
- Mak Wilson
- Â Earl Sinclair / ... 53 episodes, 1991-1994
- Tony Sabin Prince
- Â Fran Sinclair / ... 53 episodes, 1991-1994
- Julianne Buescher
- Â Additional Dinosaur Performer / ... 52 episodes, 1991-1994
- Star Townsend
- Â Additional Dinosaur Performer / ... 51 episodes, 1991-1994
- Sam McMurray
- Â Roy Hess / ... 49 episodes, 1991-1994
- Rickey Boyd
- Â Additional Dinosaur Performer / ... 34 episodes, 1992-1994
- Florence Stanley
- Â Grandma Ethyl Phillips 33 episodes, 1991-1994
- Sherman Hemsley
- Â B.P. Richfield 29 episodes, 1991-1994
- Brian Henson
- Â Grandma Ethyl Phillips / ... 19 episodes, 1991-1993
- Terri Hardin
- Â Additional Dinosaur Performer / ... 18 episodes, 1991-1993
- Suzie Plakson
- Â Monica Devertebrae / ... 14 episodes, 1991-1994
- Dave Goelz
- Â Earl Sinclair / ... 13 episodes, 1991-1992
- Michael McKean
- Â Ansel / ... 12 episodes, 1992-1994
- Christopher Meloni
- Â Spike 11 episodes, 1991-1993
- Arlene Lorre
- Â Additional Dinosaur Performer / ... 11 episodes, 1991-1992
- Rob Mills
- Â Robbie Sinclair / ... 10 episodes, 1992-1993
- Thom Sharp
- Â Bert / ... 9 episodes, 1991-1994
- Jessica Lundy
- Â Mindy / ... 8 episodes, 1992-1994
- Mitchel Evans
- Â Fran Sinclair (body) / ... 7 episodes, 1991-1992
- Tim Curry
- Â Chief Elder / ... 7 episodes, 1992-1994
- Jason Alexander
- Â Announcer / ... 7 episodes, 1991-1993
- Michael Dorn
- Â WeSaySoCorp Announcer / ... 4 episodes, 1991-1992
- Chuck Varesko
- Â TV Announcer / ... 1 episode, 1992-1993
- Kirk R. Thatcher
- Â Timmy / ... 4 episodes, 1991-1994
- Robert Picardo
- Â Clerk / ... 3 episodes, 1992-1993
- John Glover
- Â Babysitter / ... 3 episodes, 1992-1994
- Paxton Whitehead
- Â Sir David Tushingham / ... 3 episodes, 1992-1993
- James Murray
- Â Additional Dinosaur Performer 3 episodes, 1991-1992
- Kevin Carlson
- Â Additional Dinosaur Performer 3 episodes, 1991-1992
- Michael Earl
- Â Boy Contestant / ... 2 episodes, 1991
- Joyce Kurtz
- Â Brigitte / ... 2 episodes, 1994
- Glenn Shadix
- Â Monster / ... 2 episodes, 1994
- Joe Flaherty
- Â Chief Elder / ... 2 episodes, 1993-1994
- Jody St. Michael
- Â Additional Dinosaur Performer / ... 2 episodes, 1993
- Richard Portnow
- Â Mel Luster 2 episodes, 1991-1992
- David Wohl
- Â Bob 2 episodes, 1991-1993
- Gary Owens
- Â Narrator 1 episode, 1992
- David Rudman
- Â Additional Dinosaur Performer 2 episodes, 1991-1992
- John Vernon
- Â Mr. Ashland 1 episode, 1992
- Pat Crawford Brown
- Â Stenographer 1 episode, 1992
- Edward Asner
- Â Evil Georgie (regular) 1 episode, 1994
- William Schallert
- Â Wesayso Scientist 1 episode, 1992
- Jon Polito
- Â Ty Warner 1 episode, 1993
- Steven Banks
- Â Folk Singer 1 episode, 1991
- Tim Doyle
- Â General Chow 1 episode, 1991
- Shaun Baker
- Â Lingo 1 episode, 1992
- Julius Carry
- Â Mudbelly 1 episode, 1993
- Mimi Kennedy
- Â Glenda Molehill 1 episode, 1991
- Buddy Hackett
- Â Louie 1 episode, 1992
- Wendie Jo Sperber
- Â Wendy Richfield 1 episode, 1992
- Charles Kimbrough
- Â Dr. Ficus 1 episode, 1992
- Jeffrey Tambor
- Â Hank Hibler 1 episode, 1993
- Harold Gould
- Â Dinosaur Chief 1 episode, 1991
- Steve Landesberg
- Â Gary 1 episode, 1991
- Peter Bonerz
- Â Insurance Agent 1 episode, 1991
- Dan Castellaneta
- Â Zabar 1 episode, 1992
- Jason Bernard
- Â Edward R. Hero 1 episode, 1992
- Stephen Caffrey
- Â Scabby 1 episode, 1992
- Susan Norfleet
- Â Pearl Sinclair 1 episode, 1994
- Hannah Cutrona
- Â Sparky 1 episode, 1991
- Edie McClurg
- Â Shopper 1 episode, 1992
- Heather McPhaul
- Â Caller 1 episode, 1992
- Conchata Ferrell
- Â Shelly 1 episode, 1993
- Paula Marshall
- Â Cavewoman 1 episode, 1991
- Julia Louis-Dreyfus
- Â Heather Worthington 1 episode, 1992
- Tony Shalhoub
- Â Jerry Valentine 1 episode, 1992
- Michael Richards
- Â Director 1 episode, 1992
- Richard Simmons
- Â Richard Simmons Dinosaur 1 episode, 1992
- David Warner
- Â Spirit of the Tree 1 episode, 1993
- Elizabeth Collins
- Â Leeza 1 episode, 1993
- Perry Anzilotti
- Â Chang Chang 1 episode, 1991
- Teri La Porte
- Â Caveperson 1 episode, 1991
- Sally Kellerman
- Â Pteranodon 1 episode, 1992
- Kate McGregor-Stewart
- Â Neighbor No. 3 1 episode, 1992
- Tiffany Taubman
- Â Caveling 1 episode, 1993
- Jeff Chayette
- Â Ling Ling 1 episode, 1991
- Jack L. Harrell
- Â Mr. Harold Heffer 1 episode, 1991
- Ken Hudson Campbell
- Â Crazy Lou 1 episode, 1992
- George Gaynes
- Â Elder in Chief 1 episode, 1992
- Ben Ryan Ganger
- Â Caveling 1 episode, 1993
- Bob Gibson
- Â Additional Dinosaur Performer 1 episode, 1994
- David Leisure
- Â Mr. Teddy Wolfe 1 episode, 1991
- Julie Maddalena
- Â Caveman's Wife 1 episode, 1991
- Alyssa McCraw
- Â Caveling 1 episode, 1993
- G.W. Bailey
- Â Sarge 1 episode, 1992
- Fred Travalena
- Â Bob Hack 1 episode, 1992
- Noel MacNeal
- Â Additional Dinosaur Performer 1 episode, 1992
- Jarrett Lennon
- Â Kid 1 episode, 1992
- Bill Capizzi
- Â Worker 1 episode, 1992
- Eileen Dunn
- Â Miss Honeywell 1 episode, 1992
- Rick Zieff
- Â Guard 1 episode, 1993
- Cynthia Mace
- Â Myma 1 episode, 1993
- Jeffrey Lampert
- Â Ted 1 episode, 1993
- Darcy Lee
- Â Kathy 1 episode, 1993
- Holly Atkinson
- Â Julie 1 episode, 1993
- John Hawkes
- Â Andrew 1 episode, 1993
- Tim Blaney
- Â Additional Dinosaur Performer 1 episode, 1994
- Drew Massey
- Â Additional Dinosaur Performer 1 episode, 1994