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It's Always Sunny in Philadelphia S18E8 — Mac and Dennis Tear Their ACLs

7.5

It's Always Sunny in Philadelphia•Season 18•Episode 8

Mac and Dennis Tear Their ACLs

7.5/10 · 695 votesSep 28, 202621 min

Ranked #8 of 10 in Season 18•−0.4 vs season avg

Discussion

After a Christmas card catastrophe, Charlie nurses a bedridden Mac and Dennis and deliberates on which one is the originator of all their ideas. Dee and Frank are tired of being the bottom of the communication ladder and decide to flip the script.

Directed byHeath Cullens

Written byDavid Hornsby

Previous episodeE7 · Gilligan's Island: A Conspiracy Theorist's Paradise Next episodeE9 · Frank's Team: A Dark Day for Baseball

Seasons18

All 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Season 18 Episodes10

E1 7.8

Frank Marries a Corpse

E2 8.0

Dennis and Dee Don't Get Rich

E3 8.0

The Gang Gets Tested

E4 7.4

2026: A Virtual Insanity

E5 8.3

The Gang Goes to the Ren Faire

E6 8.1

The War on Alcohol

E7 6.6

Gilligan's Island: A Conspiracy Theorist's Paradise

E8 7.5Now viewing

Mac and Dennis Tear Their ACLs

E9 8.5

Frank's Team: A Dark Day for Baseball

E10 9.0

The Guys Have a Sleepover

Cast5

Charlie Day

Charlie Kelly

Glenn Howerton

Dennis Reynolds

Rob Mac

Ronald 'Mac' McDonald

Kaitlin Olson

Dee Reynolds

Danny DeVito

Frank Reynolds

Crew2

David Hornsby

Writer

Heath Cullens

Director

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Episode Summary

"Mac and Dennis Tear Their ACLs" is episode 8 of It's Always Sunny in Philadelphia season 18. It scored 7.5/10 from 695 votes, ranking #8 of 10 episodes this season (season average 7.9). Directed by Heath Cullens and written by David Hornsby, it aired on September 28, 2026.

Next: E9 · Frank's Team: A Dark Day for Baseball Best of Season 18