It's unbelievable, isn't it? I also knew about other worlds already because mine got visitors from across the universe - not from across the multiverse, though.

[Or maybe it did, considering all the parodies and crossovers... okay, no, he's not going to think too deeply about that now.]

This is only a theory, but I feel like once you get called in by one of these worlds in need of help you're more likely to have it keep happening. Perhaps we build up something like hero credentials?

[What is this, an RPG?]