The Associated Press

NEW YORK (AP) -Put four men and four women on a six-year space mission and what happens?

Things "get fun pretty quickly," says Ron Livingston, star of the new ABC summer series "Defying Gravity."

The sci-fi show, which debuts Sunday with a two-hour episode at 9 p.m. EDT, has a real saucy side, as you would expect from the creators behind "Desperate Housewives" and "Grey's Anatomy." Naked bodies float around from time to time, sometimes engaged in simulated sex.

Livingston, who played Carrie Bradshaw's boy pal Jack Berger on "Sex and the City," says "Defying Gravity" producers wanted a show for both men and women, "something that was sleek and sexy and exciting."

The series involves a crew whose mission is to study the solar system but who soon find out that there's a mysterious, secondary agenda; strange things start happening onboard. Livingston's Maddux Donner, commander of the spaceship, is thrust into a romantic triangle when he joins up and finds two ex-girlfriends on board.

Malik Yoba co-stars as the ship's co-pilot.

ABC is owned by The Walt Disney Co.

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