File this under “can't end well.” On one hand, we have Colin Sullivan (Matt Damon), a Massachusetts cop/promotion magnet who actually is a plant on behalf of Irish mob boss Frank Costello (Jack Nicholson). But wait, here's Billy Costigan (Leonardo DiCaprio)! He's a fast-rising member of Costello's inner circle who actually is a plant on behalf of the Massachusetts State Police.

None of this is spoiler-worthy: Rather than do some tired march toward a second-act twist we'd probably spot a mile away, The Departed lays this out within the first 10 minutes and clears the dance floor for a fantastic tango between two guys frantically racing to expose one another before being uncovered themselves. If this sounds familiar, it might be because The Departed actually is a remake of the 2002 Hong Kong classic Internal Affairs .

But it's a remake of the best kind, shining brilliantly on its own merits while paying great respect to a film trilogy that's every bit as much a must-see as it's ever been. Mark Wahlberg, Alex Baldwin, Martin Sheen, Vera Farmiga, Ray Winstone, Anthony Anderson, Kevin Corrigan and James Badge Dale round out the loaded and very gifted cast.

Extras: Deleted scenes (with director Martin Scorsese intro), feature-length Scorsese special and two behind-the-scenes features.

Grade: A