It’s Always Sunny in Philadelphia 12×10 “Dennis’ Double Life” Season 12 Episode 10 Promo (Season Finale) – Dennis reveals he has a baby from his Wade Boggs layover in North Dakota. Everyone offers a solution for how to get him out of this jam. Mac suggests they pretend to be a couple and Frank wants to make the broad a “decent” proposal b/c $1 million for sex is indecent. In the end, Dennis has to decide which life he wants to continue to lead. Written by Charlie Day & Glen Howerton & Rob McElhenney; Directed by Matt Shakman.