Sister McPoyle is a fictional character portrayed by Liz Pellini in the TV series It's Always Sunny in Philadelphia.
They appear in 1 episodes out of a total of 172 aired so far
Episodes1
The Gang Gets Invincible
episode S3.E2 september 2007Dennis, Mac, and Dee take part in the Philadelphia Eagles' open tryouts, while Frank drops acid and freaks out when he and Charlie tailgate next to the McPoyles.