It's About Time (1966-67) was about two astronauts who, after breaking the speed of light, accidentally travel back in time to prehistoric Earth. Unable to return, they make friends with the "natives" in the stone age. An attempt to do a live-action version of The Flintstones.Halfway through the season, having run out of stone-age jokes, the show was retooled by having the astronauts manage to fix their spacecraft and return, bringing some of the stone-age characters with them, turning the show into a Fish out of Water about stone-age characters trying to figure out modern life. This wasn't very successful either, and the show only lasted the one season.
- Animated Credits Opening: Revamped with its plot points reversed after the Retool.
- Blazing Inferno Hellfire Sauce: In "Stone Age Diplomats", the food that Shad and Gronk prepare for the astronauts and the "Ambassador of Nordania". It's a mixture of everything with a generous helping of hot sauces mixed in. Naturally, the astronauts, the ambassador and the landlord choke or gulp down water. Shad and Gronk love it.
- Comic-Book Adaptation: One issue long.
- Contemporary Caveman
- Everytown, America: Riverview, Ohio; Lt. Hector Canfield's oft-mentioned hometown.
- Expository Theme Tune
- Fantastic Comedy
- Fish Out of Temporal Water
- Fish out of Water
- Getting Crap Past the Radar: In the pilot the female Cave Dweller was named Shag. The radar then got fixed for the series in which her name became Shad.
- Half Hour Comedy
- Machine Worship: In School Days, School Days, Shad and Gronk give a sacrifice to the garbage disposal calling it the "god of Garbage"! At the end of the episode, after Mac and Hector enroll them in night school to catch up on a million years of civilization, Gronk mentions they're going to be taught about Edison, god of the Electric light.
- My Life Flashed Before My Eyes: In "Androcles and Clon", it was said by both astronauts after a narrow escape with being clubbed and pushed off a cliff by Clon.
- Nubile Savage: Cavegirl Mlor, the daughter of Shad and Gronk. She's a beautiful teenaged blond, dressed in animal furs. This is in spite of living in a cave in a million B.C, amongst a very primitive tribe. Astronauts Mac and Hec were both instantly smitten when they first met her in "And Then I Said Happy Birthday To You".
- Prop Recycling: Sherwood Schwartz reused the Gilligan's Island lagoon and the spacecraft used in one GI episode.
- Sherwood Schwartz, of Gilligan's Island and The Brady Bunch fame, created it.
- Time Travel
- Trapped in the Past, turning into Get Back to the Future when they fix their spacecraft.