YEEHAAAAA!!!!!
After this thread got my "wish I could see it again" juices flowing, I had a real search session to find anything at all on "It's About Time", the 1966 show about two astronauts (Hector & Mac) who take a wrong turn and break the time barrier to end up back in the stone age with a cave couple (Gronk, Shad & their kids). They eventually repair their ship (a Gemini capsule if I remember rightly) and take off again with the family in tow. They make it back through the time warp and end up back in Los Angeles in their present-day. Then the second half of the series is about the cave people trying to adjust to modern city life in the 20th century. A comedy that was done on a budget but should have gone on longer.
Anyway.... I FOUND THE ENTIRE SERIES ON DVD!!!!!!!
Good old eBay!
http://cgi.ebay.com/ws/eBayISAPI.dll..._promot_widget
Can't wait!