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(Photo : Screenshot: Youtube/Frank Reynolds (Best of Its Always Sunny in Philadelphia)) Dennis and Dee listen to Frank in 'It's Always Sunny in Philadelphia' season 12

"It's Always Sunny in Philadelphia" recently ended its 12^th season and fans of the TV series are expected it's return year for its historic 13^th season. But the season finale of the popular comedy series hints that one of their main characters might not be back for another season.

Season Finale for Dennis (Warning: Spoilers)

According to Indie Wire, the season finale of "It's Always Sunny in Philadelphia" surprised fans of the long time comedy series. Dennis Reynolds (Glenn Howerton) actually had a son when he visited Idaho (from season 10) but he's known there are Brian. Initially, the gang had a plan on making the child and the mother go away but things turned to something unexpected and Dennis announced he's leaving - and the gang using his rocket launcher to destroy his rover.

Dennis' leaving the gang to be with his son could actually spell the end of the character. Digital Spy reports that Howerton will be starring with Patton Oswalt for a comedy pilot on NBC which puts the actor in scheduling concerns with the series if it pushes through.

But Howerton is not pushing the case that he's really leaving and there's no row with anyone associated to the show. The actor indicated that the show could be on an extended hiatus before it returns for 13^th season.

Another First in the Series

While the series finale certainly left a shock to fans of the comedy series, but something else happened for the first time in 12 years: Charlie (Charlie Day) finally got in bed with the waitress (Mary Elizabeth Ellis). After berating her that time is running out, she finally agreed and even made sure she gets pregnant. But as fans are expecting a happy ending, "It's Always Sunny in Philadelphia" always has a knack in pushing the worst out of their characters as the waitress goes on a rant on what Charlie should do even though she's not pregnant yet.

No word yet on the series' 13^th season but Howerton certainly holds the key for the gang's continuation. Although Ellis could replace him (even though she's still unnamed after 12 season), it's just not the same.