It's Always Sunny in Philadelphia Season 4 Characters & Cast — No Spoilers
Every character in It's Always Sunny in Philadelphia season 4 with photos and the actors who play them, including Charlie Day, Glenn Howerton, Rob Mac — spoiler-free, nothing from later seasons.
- Charlie Kelly — played by Charlie Day
- Dennis Reynolds — played by Glenn Howerton
- Ronald 'Mac' McDonald — played by Rob Mac
- Dee Reynolds — played by Kaitlin Olson
- Frank Reynolds — played by Danny DeVito
- Waitress — played by Mary Elizabeth Ellis
- Matthew 'Rickety Cricket' Mara — played by David Hornsby
- Artemis — played by Artemis Pebdani
- Luther — played by Gregory Scott Cummins
- Charlie's Mom — played by Lynne Marie Stewart
- Jan — played by Keir O'Donnell
- Mac's Mom — played by Sandy Martin
- Gladys — played by Mae LaBorde
- Warden — played by Geoff Pierson
- Jail Guard — played by Bill M. Puluti
- Bus Driver — played by Georgia McGreggor
- Party Girl — played by Nicole Marie White
- Scientist — played by Jason Duplissea
- Lyle Korman — played by Fisher Stevens
- College Student — played by Fran Kranz
All seasons of It's Always Sunny in Philadelphia: full spoiler-free character guide