Joe Morton leads this backward-running mystery. Here’s why this X-Files episode still holds up even though Doggett and Scully step back.

"It's Always Sunny in Philadelphia" had the writers and cast taking on the system in the last episode of season 16. Fans who have been watching since at least season eleven know that the writers tend to turn the last episode of the season from an anything-goes sitcom into more of a heartfelt, dramedy. My favorite season finale episodes were "Mac Finds His Pride," "Waiting For Big Mo," and now, "Dennis Takes a Mental Health Day." But that changes every time I rewatch an episod