NBC’s new chief, Bob Greenblatt, the programming executive who transformed Showtime network into a pay-TV powerhouse, is telling Tinseltown producers that he’s going to push the boundaries of broadcast television in a bid to revive the Peacock network.

Greenblatt, who built his reputation on shows such as “The L Word,” “The Tudors” and “Dexter,” is eager to ramp up production of edgier, less mainstream programming when he officially takes over as chairman of NBC Universal Entertainment, according to sources.

One source, who recently met with Greenblatt, said he’s prepared to push the envelope as far as his new bosses will let him.

Greenblatt reports to Comcast’s Steve Burke, who will replace outgoing NBC Universal CEO Jeff Zucker once Comcast completes its takeover of the entertainment giant.

“He’s trying to find his way with Comcast management in terms of how racy they want to go,” the source said.

Greenblatt is arriving at NBC during television’s busiest time of the year — pilot season — when network execs pick new shows for the coming fall schedule. The pressure is on Greenblatt to revive the fourth-place network after the collapse of its prime-time entertainment schedule.

Sources said Greenblatt has been holed up on the NBC lot at the Lew Wasserman building in Los Angeles for weeks quietly reading scripts. Already, his early picks suggest he’s looking to inject some of Showtime into NBC, including programming that touches on gay and lesbian themes and sexual situations.

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