Even a master of comedy like Martin Mull occasionally finds himself required to audition. And the sound reverberating from inside the casting room as he waited to read for “The Cool Kids,” the new sitcom from Charlie Day of “It’s Always Sunny in Philadelphia,” made him downright nervous. — and there’s nothing worse for an actor than to hear the other guy doing that well,” he recalled. But when the door opened, it was David Alan Grier, one of Mr. Mull’s best friends, and a potential co-star. They’re insistent that she move, she’s insistent that she won’t, and soon “the four of us are the junta running the place,” he said.

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Persons: Martin Mull, Charlie Day, “, ”, David Alan Grier, Mull’s, ‘ We’ve, ’, Mull, Charlie, Grier, Hank, Leslie Jordan, Sid, Jerry, —, Margaret, Vicki Lawrence Organizations: Fox Locations: Philadelphia