TV It's Always Sunny in Philadelphia - Season 3 Episode 10 : Mac Is a Serial Killer It's Always Sunny in Philadelphia - Season 3 Episode 10 : Mac Is a Serial Killer 8.3/10 by 1192 users After Mac arrives to the bar with scratches on his neck and exhibiting strange behavior, Frank comes to the conclusion that he is the serial killer terrorizing young women in Philadelphia. Frank sets out with his trusty chainsaw and a doubtful Charlie to find evidence to implicate Mac in the murders. In search of another suspect, Dennis and Dee do a little role-playing in order to help themselves better understand who they might be dealing with. Details Casts Posters Images Title It's Always Sunny in Philadelphia - Season 3 Episode 10 : Mac Is a Serial Killer Alternative Titles It’s Always Sunny, Always Sunny, FX's Sunny First Air Date 2005-08-04 Last Air Date 2025-08-06 Number of Episodes 177 Number of Seasons 17 Genres Comedy, Networks FX, FXX, Casts Charlie Day, Glenn Howerton, Rob Mac, Kaitlin Olson, Danny DeVito Plot Keywords , Charlie Kelly Charlie Day Dennis Reynolds Glenn Howerton Ronald 'Mac' McDonald Rob Mac Deandra 'Dee' Reynolds Kaitlin Olson Frank Reynolds Danny DeVito Episodes List It's Always Sunny in Philadelphia Season 3 :Episode 1 The Gang Finds a Dumpster Baby The Gang Finds a Dumpster Baby 2007-09-13 Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships.... It's Always Sunny in Philadelphia Season 3 :Episode 2 The Gang Gets Invincible The Gang Gets Invincible 2007-09-13 Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships.... It's Always Sunny in Philadelphia Season 3 :Episode 3 Dennis and Dee's Mom Is Dead Dennis and Dee's Mom Is Dead 2007-09-20 Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships.... It's Always Sunny in Philadelphia Season 3 :Episode 4 The Gang Gets Held Hostage The Gang Gets Held Hostage 2007-09-20 Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships.... It's Always Sunny in Philadelphia Season 3 :Episode 5 The Aluminum Monster vs. Fatty Magoo The Aluminum Monster vs. Fatty Magoo 2007-09-27 Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships.... It's Always Sunny in Philadelphia Season 3 :Episode 6 The Gang Solves the North Korea Situation The Gang Solves the North Korea Situation 2007-09-27 Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships.... It's Always Sunny in Philadelphia Season 3 :Episode 7 The Gang Sells Out The Gang Sells Out 2007-10-04 Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships.... It's Always Sunny in Philadelphia Season 3 :Episode 8 Frank Sets Sweet Dee On Fire Frank Sets Sweet Dee On Fire 2007-10-04 Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships.... It's Always Sunny in Philadelphia Season 3 :Episode 9 Sweet Dee's Dating a Retarded Person Sweet Dee's Dating a Retarded Person 2007-10-11 Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships.... It's Always Sunny in Philadelphia Season 3 :Episode 10 Mac Is a Serial Killer Mac Is a Serial Killer 2007-10-18 Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships.... It's Always Sunny in Philadelphia Season 3 :Episode 11 Dennis Looks Like a Registered Sex Offender Dennis Looks Like a Registered Sex Offender 2007-10-25 Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships.... It's Always Sunny in Philadelphia Season 3 :Episode 12 The Gang Gets Whacked (1) The Gang Gets Whacked (1) 2007-11-01 Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships.... It's Always Sunny in Philadelphia Season 3 :Episode 13 The Gang Gets Whacked (2) The Gang Gets Whacked (2) 2007-11-01 Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships.... It's Always Sunny in Philadelphia Season 3 :Episode 14 Bums: Making a Mess All Over the City Bums: Making a Mess All Over the City 2007-11-08 Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships.... It's Always Sunny in Philadelphia Season 3 :Episode 15 The Gang Dances Their Asses Off The Gang Dances Their Asses Off 2007-11-15 Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships....