After its success with "Leverage," which returns at 9 p.m. Wednesday, TNT takes the team-of-crime-fighters concept and plunges it into humorless territory with "Dark Blue (10 p.m. Wednesday). It's an OK but not exceptional crime drama, yet another iteration in the ever-expanding genre executive produced by Jerry Bruckheimer ("CSI," "Cold Case").

Dylan McDermott ("The Practice") stars as Lt. Carter Shaw, leader of an undercover, off-the-books task force. In the premiere, the feds fear team member Dean (Logan Marshall-Green, "The O.C.") has joined a gang he infiltrated as an undercover. Carter begins to have his doubts, too.

"There's going under and there's stepping over the line," Carter says. "I get scared when I don't know the difference."

To figure out what's going on, Carter calls on frequent collaborator Ty (Omari Hardwick), who agonizes over relationships in both his real life and his undercover life. Carter also recruits skillful liar Jaimie (Nicki Aycox), a beat cop.

"Dark Blue" makes half-hearted efforts to give the characters backstories so they can grow and develop in future episodes but the script, written by Doug Jung ("Big Love"), doesn't do much to differentiate "Dark Blue" from the dozens of crime dramas that preceded it.