Concept: TV show where the initial viewpoint character is a cyborg mutant from a dystopian post-apocalyptic future who’s come back in time to prevent said apocalypse, except they succeed in like the second episode and the rest of the show is just a fish-out-of-water comedy about them adapting to early 21st Century society.
… or so it appears, until about episode five, where another time-travelling weirdo from a different dystopian post-apocalyptic future arrives, and after much confusion, ends up teaming up with the first character to prevent that apocalypse, too.
The show continues in this vein for several iterations, eventually accumulating an ensemble cast of temporally displaced whatsits from futures that no longer exist. None of the saving-the-future bits ever occupy more than a single episode, with the rest of the show being taken up with shit like an entire episode about an eight-foot-tall transhuman cyborg spending all day stuck in line at a bank.
There needs to be some kind of Terminator-esque antagonist who shows up with the intentions of ensuring that some dystopian apocalypse happens. While initially it seems like the show’s taking a More Serious Turn,™ they degenerate over the next few episodes (or just one episode) into being the sitcom kind of arch-nemesis where nothing escalates beyond incessant barbed insults.