Elroy Jetson invents a time machine that takes him back to prehistoric times, where he meets the Flintstone family.
Mel Blanc
Barney Rubble / Dino / Mr. Spacely (voice)
Daws Butler
Elroy Jetson / W.C. Cogswell / Henry Orbit (voice)
Don Messick
Astro / R.U.D.I / Mac / Announcer / Store Manager / Robot (voice)
Henry Corden
Fred Flintstone / Knight (voice)
Jon Bauman
Iggy (voice)
Hamilton Camp
Turk Tarpit (voice)
Julie McWhirter
Betty Rubble / Jet Rivers / Investor / Panelist / Harem Girl (as Julie Dees) (voice)
George O'Hanlon
George Jetson (voice)
Penny Singleton
Jane Jetson (voice)
John Stephenson
Mr. Slate / Moderator / Investor / Poker Player (voice)
Brenda Vaccaro
Didi (voice)
Jean Vander Pyl
Wilma Flintstone / Rosie / Mrs. Spacely (voice)
Janet Waldo
Judy Jetson / Female Computer (voice)
Frank Welker
Dan Rathmoon / Johnny / Mr. Goldbrick (voice)
Patric Zimmerman
(voice)
