Lionel is a fictional character portrayed by Martin Beck 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 Finds a Dead Guy
episode S1.E6 september 2005A guy dies in Paddy's pub. Dennis and Mac use the guy's death as an excuse to get close to the guy's attractive granddaughter. Meanwhile, Charlie discovers that Dennis and Dee's grandfather was a Nazi.