Ahhh, that's good! Maybe he and Joel run into each other because they're doing supply runs in the same place, and then it turns out they've got to survive through it? I'm not sure if you wanted to have the Infected from TLOU to be the plague here or the zombies from WWZ, but I'm good with either!
Joel himself isn't the type for teaming up, but he does whatever he has to to survive, and if it's going with some kid he doesn't know shit about then he'll do it until they don't have to stick around each other any more. :|
YEP I HAVE NEVER HEARD OF A WWZ MOVIE. What. But reading this reminds me of how Battle Royale was told in the novel (it jumps from character to character to see how the game goes) and how fucked up that was in its film, rip. Why do movie adaptations always suck ass.