We'll blame it on the beer, but it seems like every time we catch a Bar Wars episode of Cheers, Gary, the owner of Gary's Old Towne Tavern, looked a little different. The truth is, the enemy on Cheers was always different. Polis and Desiderio switched off on the character throughout the show's run. When they first shot a Bar Wars episode, Polis wasn't available. It was towards the end of the season and the show had no other scripts ready to go, so they just recast. When Bar Wars II came along, they went back to Polis. Throughout the years, they'd continue to alternate, so you'd never know which Gary you'd get.
Joel Polis and Robert Desiderio Alternated Playing Gary on Cheers