Is time a giant flowing river that will change course if you alter it? Is it a giant network of infinite streams? Is time really a thing or is it just a construct? Is Back To The Future bullshit? What about Bill and Ted or Fringe or Sliders? While we’re at it, did Avengers: Endgame get it right? What is Deja vu? All of these questions get touched upon in this week’s episode, the halfway point of season three.