Mr. Scizak, 40, has been a stunt performer and coordinator for roughly 20 years. In that time, he’s worked on films and shows that would seem to naturally involve plenty of dangerous action (“Dunkirk”) and others that might not (“The Goldbergs,” “Pretty Little Liars”).

“Sunny,” a zany comedy about five narcissists running a bar, falls in the latter category. But the show also includes plenty of physical high jinks alongside all the preposterous plans and toxic behavior. (Mr. McElhenney, the creator, gained 50 pounds ahead of Season 7 as part of an extended gag. In Season 13 he is incredibly fit, the subject of a running joke in Wednesday’s premiere.)

Mr. Scizak, who joined “Sunny” in 2009, is Mr. McElhenney’s stunt double and has contributed to more than 50 episodes.

“My job is to essentially take out as many variables as possible and keep them as safe as possible without impeding their comic genius,” Mr. Scizak said.

[ Read an interview with the stars of “It’s Always Sunny.” ]

When Mr. Howerton, Mr. Day and Mr. McElhenney, who write many of the episodes, include stunt scenes, Mr. Scizak plans how they would be executed and takes note of potential risks.