Kieran Culkin, Nick Offerman, and Megan Mullally are in negotiations to headline the new comedy Infinity Baby, which will be directed by Bob Byington. The project, which is set to start shooting Sunday in Austin, is being called a “lightly futuristic comedy about babies who don’t age.”

Culkin plays a guy who works at Infinity Baby, a company tasked with farming out 3-month-olds. Co-starring in the film will be Jon Togo, Kevin Corrigan, Martin Starr, Noel Wells, Stephen Root and Trieste Dunn. Onur Tukel penned the screenplay.

Bob ByingtonThe film is being executive produced by Faliro House’s Christos Konstantakopoulos with Barry Lacina, Rebecca Eskreis, Veronica Leon and Offerman producing. Konstantakopoulos and Byington have worked on previous projects together, including 7 Chinese Brothers and Somebody Up There Likes Me.

Konstantakopoulos has been the exec producer on a flurry of films, including The Weinstein Co.’s August 5 release The Founder — in which Offerman co-stars with Michael Keaton — Midnight Special, The Lobster and Before Midnight, to name a few.

Culkin recently appeared in both Todd Solondz’s independent film Wiener-Dog, which premiered at Sundance, and on Broadway in Kenneth Lonergan’s This Is Our Youth. Culkin, who played Rye Gerhardt on FX’s Fargo, is repped by Brookside Artist Management.

Offerman (Ice Age: Collision CourseParks and Recreation) also wrote a book called Good Clean Fun, which will debut in October. The husband/wife team of Offerman and Mullally also work together in the Summer of 69 Comedy Tour. Mullally (Children’s Hospital, Bob’s Burgers) stars opposite Bryan Cranston and James Franco in Fox’s Christmas release Why Him from John Hamburg. She also just wrapped the first season of NBC’s You, Me and the Apocalypse. Both are repped by UTA.