'Abbott Elementary' top secret crossover episode revealed to be with 'It’s Always Sunny in Philadelphia'
That's right, the Paddy's Pub gang and Abbott's faculty and staff will join forces for a special crossover episode. Rob McElhenney confirmed the comedy link up with an Instagram post of himself, Sunny costar Charlie Day, and Abbott creator and star Quinta Brunson in front of the painted brick wall prominently featured in her series' intro montage.