REPORTER: [Donnie Wahlberg is now doing]….A new line of work, he's laying down the law in the Old West. He was a teeny bopper idol as New Kids on the Block sold out stadiums from Boston to Brazil. (clip of concert)

DONNIE: This is a peacemaker, colt 45. This is the first cowboy movie where the hero doesn't need to know how to use a gun. (laughs)

REPORTER: Donnie slapped on six-shooters to play a deputy in the new TNT film called "Purgatory."

DONNIE: Right now I'll do a quick draw.

REPORTER: Outlaw Brad Rowe doesn't stand a chance! 1-2-3!

DONNIE: That was right on it!

BRAD: You did it on two!

DONNIE: No, I use a special clock to crack this whip!

BRAD: I want a rematch! I want a rematch!

REPORTER: Donnie has been hankered to do a western since his father took him and his little brother, Mark, to see the classic, "Shane."

DONNIE: He made us watch it, and we loved it, we loved "Shane." It was probably the first western that I really, really enjoyed.

REPORTER: Besides Donnie and Brad, "Purgatory" also stars Sam Shepard, Eric Roberts and Randy Quaid, and will air in January on TNT cable.