Endgame gives a not subtle nod to Star Trek, Terminator, Time Cop, Time After Time, Quantum Leap, Wrinkle in Time, Somewhere in Time, Hot Tub Time Machine, Bill and Ted’s Excellent Adventure, Die Hard, and Back to the Future for their establishing the rules of time travel and then immediately tries to re-write those rules. Uhm, hello!?! The rules were established in the past, silly rabbit! And you can’t go back and change the past. Right?