In memory of Sid Krofft, I'm going to present again my #LandOfTheLost / #DoctorWho crossover theory that posits that LOTL is just a DW spin-off. You'll be surprised how many connections the two shows have!
But that's hardly proof it exists in the same timeline as Doctor Who, is it?
The first piece of evidence is that the Land of the Lost is filled with TARDISes. The Marshall family call them "pylons" but they're clearly TARDISes. They have the same basic exterior structure and are impervious to damage.
@SKleefeld Alternate theory: The LotL is a middle-step between SIDRATs and TARDISes.
Either way, though, I wonder if/how Sleestaks, Silurians, and Sea Devils are connected...