NBC's new mid-season drama "The Black Donnellys" will premiere on Monday, March 5 (10-11 p.m. ET) -- following the hit drama Heroes (9-10 p.m. ET) – while the new comedy "Andy Barker, P.I.," starring Andy Richter, will debut on Thursday, March 15 (9:30-10 p.m. ET).

Studio 60 on the Sunset Strip (currently Mondays, 10-11 p.m. ET) will return later this season on a date to be determined. 30 Rock will return to its previous Thursday (9:30-10 p.m. ET) day and time with original episodes on April 19 after "Andy Barker" completes its slate of episodes.

Academy Award winners Paul Haggis and Bobby Moresco are the creators and executive producers of "The Black Donnellys," a gritty new crime-drama series filmed in New York City and loosely based on Moresco's background.

The series follows the exploits of four young, working-class Irish-American brothers and their involvement in organized crime in New York City. The Donnelly brothers will do anything to protect each other against all odds.

In the comedy "Andy Barker, P.I.," Richter re-teams with Conan O'Brien (series co-creator and executive producer). Richter portrays Andy Barker, an earnest, hard-working CPA who has succeeded at everything -- until his new accounting business fails to take off. But when he's mistaken for Lew Staziak (Harve Presnell), the retired private detective who used to occupy his storefront office, Andy embraces the twist of fate and dives into his double life.