When the narcissistic gang from "It’s Always Sunny in Philadelphia" visited the "Abbott Elementary" school in a crossover episode earlier this year, audiences got to see the two Philly TV universes collide in hilarious ways — all while keeping the episode PG for "Abbott’s" more family-oriented viewers.

Season 17, Episode 1 of FX's "It's Always Sunny in Philadelphia," marks part two of its crossover event with ABC's "Abbott Elementary."

Abbott Elementary” fans, you’ve never seen sweet and innocent school teacher Janine Teagues like this. But on Wednesday’s Season 17 premiere of “It’s Always Sunny in Philadelphia,” Janine — and much of the rest of the show’s cast,