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New Line's fast-tracking an untitled action pic starring Channing Tatum ("Step Up") as an undercover cop, preemptively snapping up a pitch by T. J. Scott and Kevin Lund and setting it up with Marty Bowen and Wyck Godfrey.

Story centers on a New York City cop who must infiltrate the underground world of free running, known as Parkour, to bust a seemingly unstoppable gang of bank robbers.

New Line bought the pitch Wednesday.

Tatum will be seen next in Paramount's Kimberly Peirce-directed "Stop-Loss" and Stuart Townsend's "Battle in Seattle." Scott and Lund, who previously set up a "Vivaldi" biopic at Imagine, will pen the screenplay.

Bowen and Godfrey are based at New Line through their Temple Hill banner. They made their debut with "The Nativity Story"; they're developing two other New Line projects -- rodeo romancer "Paper Wings" and political thriller "Material Breach" with Contrafilm partners Beau Flynn and Tripp Vinson.