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''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 ''WesternAnimation/TheFlintstones''.

Halfway through the season, having run out of stone-age jokes, the show was {{retool}}ed 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 FishOutOfWater about stone-age characters trying to figure out modern life. This wasn't very successful either, and the show only lasted the one season.
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!!Tropes:
* OneMillionBC: The astronauts accidently break the time barrier and get stranded in One Million B.C.
* AnimatedCreditsOpening: Revamped with its plot points reversed after the {{Retool}}.
* BlazingInfernoHellfireSauce: 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.
* ComicBookAdaptation: One issue long.
* ContemporaryCaveman: After Shad, Gronk, Breer and Mlor return to the 20th century with Mac and Hec.
* DecidedByOneVote: In the episode "Mark Your Ballots", Mac and Hector convince the cave-people to have an election, running Boss against Gronk. The election results in a tie, but at the last minute an old woman named Trong, who lives near the tar-pits, arrives to vote for Boss.
* EverytownAmerica: Riverview, Ohio; Lt. Hector Canfield's oft-mentioned hometown.
* ExpositoryThemeTune: ''It's About Time, It's About Flight, It's About Travelling Faster Than The Speed of Light''. In an interview, Sherwood Schwartz said it was the best theme tune he ever wrote. That's something, considering he was responsible for the iconic and well-loved ''Series/BradyBunch'' and ''Series/GilligansIsland'' theme tunes.
* FantasticComedy: Time travel, astronauts, cave-people, dinosaurs.
* FishOutOfTemporalWater: The astronauts in One Million B.C., particularly Hector who never seems to try to adapt or adjust his behavior to the circumstances. Later, Shad, Gronk, Breer and Mlor in the 20th century. It's implied, though, that they'll slowly get better.
* FishOutOfWater: Again, the astronauts in One Million B.C., and the cave-family in the 20th century.
* GettingCrapPastTheRadar: In the pilot the female Cave Dweller was named Shag. The radar then got fixed for the series in which her name became Shad.
* HalfHourComedy
* MachineWorship: 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.
* MyLifeFlashedBeforeMyEyes: In "Androcles and Clon", it was said by both astronauts after a narrow escape with being clubbed and pushed off a cliff by Clon.
* NubileSavage: 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".
* PropRecycling: Creator/SherwoodSchwartz reused the ''Series/GilligansIsland'' lagoon and the spacecraft used in one ''GI'' episode.
* Creator/SherwoodSchwartz, of ''Series/GilligansIsland'' and ''Series/TheBradyBunch'' fame, created it.
* TimeTravel: A round trip for the astronauts, one way for Gronk, Shad, Mlor and Breer.
* TrappedInThePast, turning into GetBackToTheFuture when they fix their spacecraft.
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