One of my favorite sci-fi tropes is alternate universes . Okay, it might be more than a trope. It might be real if certain astrophysicists are to be believed. But I love to see it represented in movies and TV because the concept is so endlessly interesting and also hard to wrap your head around. You mean there are infinite universes out there, and some of them might look EXACTLY like this one, except that I was born with blue hair and that was totally normal? Infinity is an almost impossible th…