Obviously, making an origin story about a character who isn’t supposed to actually exist raises all sorts of existential issues but …. well, look. It’s PIXAR. And The LEGO Movie worked, didn’t it? And yes, I realize that the LEGO Movie was not a PIXAR film but I’m just saying that there’s all sorts of things that work in animation that wouldn’t necessarily work in live action.
Anyway, here’s the second trailer for Lightyear!

