CBS Pilot Scoop: Mary Elizabeth Ellis Joins Greg Garcia Comedy as Will Arnett's Sister

CBS Pilot News: Mary Elizabeth EllisWill Arnett’s new TV family continues to grow, with the addition of Mary Elizabeth Ellis (It’s Always Sunny in Philadelphia) to Greg Garcia’s untitled comedy pilot for CBS.

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Penned by Garcia and to be directed by Jim Burrows, the multi-cam project follows Jack, a recently divorced guy whose life gets more complicated when his parents have marital problems of their own.

Margo Martindale previously was cast as Jack’s mother Carol. Ellis meanwhile will play his sister Debbie. (Fun-ish fact: On Up All Night, Ellis played Arnett’s ex-sister-in-law. Like I said — fun-ish.)

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JB Smoove (Curb Your Enthusiasm) is also part of the Garcia pilot ensemble, as Jack’s best bud Deweyne.

In addition to waiting tables on It’s Always Sunny, Ellis’ many TV credits include New Girl and Perfect Couples.