It's Always Sunny in Philadelphia - Season 3 - Eps 1: The Gang Finds a Dumpster Baby
Dennis joins up with an environmentalist group, but his altruistic intentions quickly sour when he's snubbed by the activists. Dee and Mac decide to raise a baby they find in the dumpster, but quickly find out that it's not nearly as fun as they thought it would be, and Frank and Charlie take the concept of recycling a bit too far.
About It's Always Sunny in Philadelphia

Title: It's Always Sunny in Philadelphia
First Air Date: 2005-08-04
Last Air Date: 2023-07-19
Status: Returning Series
Rating: 8.279/10 (from 1129 votes)
Language: EN
Seasons: 17
Total Episodes: 169
Network: FX FXX
Genres: Comedy
Production Companies: 3 Arts Entertainment, Bluebush Productions, FX Productions, RCG Productions
Synopsis
Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships. Unfortunately, their warped views and precarious judgments often lead them to trouble, creating a myriad of uncomfortable situations that usually only get worse before they get better.
Cast

Charlie Day
Charlie Kelly

Glenn Howerton
Dennis Reynolds

Rob McElhenney
Ronald 'Mac' McDonald

Kaitlin Olson
Deandra 'Dee' Reynolds

Danny DeVito
Frank Reynolds