After the jump, finale dates for "30 Rock" and "The Office" (Amy Ryan returns!) and other items of potential interest. ...
NBC has a super sweeps lineup in April and May with live season finale episodes of its hit reality series "The Biggest Loser: Couples" and "The Celebrity Apprentice" as well as a special season finale episode of "30 Rock" featuring Alan Alda along with marquee musical artists -- plus a celebration of the 100th episode of the Emmy Award-winning "The Office," the all-new "Saturday Night Live" special "Saturday Night Live Just Shorts" and a fistful of series guest stars.
The April-May guest stars include: Alan Alda, Sheryl Crow, Mary J. Blige, Elvis Costello, Clay Aiken, Adam Levine, Salma Hayek, Elaine Stritch, Sherri Shepherd and Steve Buscemi ("30 Rock"); Hilary Duff, Swoosie Kurtz and Gail O'Grady ("Law & Order: Special Victims Unit"); Edward Herrmann ("Law & Order"); Geraldo Rivera, Norm MacDonald and NASCAR driver Michael Waltrip ("My Name Is Earl"); Michael Dorn and Zeljko Ivanek ("Heroes"); Tom Sizemore and C. Thomas Howell ("Southland"); Macaulay Culkin and Leslie Bibb ("Kings"); Amy Ryan and Idris Elba ("The Office"); Morgan Fairchild, Bruce Boxleitner, Scott Bakula and Chevy Chase ("Chuck"); and Tracy Pollan, Anjelica Huston, David Morse, Jeffrey Tambor, Balthazar Getty and Rumer Willis ("Medium").
"The Office" will celebrate its 100th installment on Thursday, May 14 (9-9:30 p.m. ET) in its season finale involving an eventful company picnic guest starring Amy Ryan and Idris Elba.
The live three-hour finale of "The Biggest Loser: Couples" airs on Tuesday, May 12 (8-11 p.m. ET) and "The Celebrity Apprentice" wraps up its season with a special live three-hour episode on Sunday, May 10 (8-11 p.m. ET).
The "Saturday Night Live Just Shorts" special hosted by Andy Samberg will air on Sunday, May 17 (9-11 p.m. ET).
"30 Rock" concludes its third season on Thursday, May 14 (9:30-10 p.m. ET) with a special episode featuring Alan Alda and surprise musical guests.
The climactic finale episode of "Heroes" airs Monday, April 27 (9-10 p.m. ET); the "Chuck" finale airs on Monday, April 27 (8-9 p.m. ET) and "Howie Do It" concludes with its season finale on Friday, May 1 (8-8:30 p.m. ET).
In addition, NBC's popular new comedy "Parks and Recreation" (Thursdays, 8:30-9 p.m. ET) will continue with original episodes through April and May with its finale on May 14; the new hit drama "Southland" concludes its season on Thursday, May 21 (10-11 p.m. ET).
"Deal or No Deal also will return to the lineup in sweeps with some original event episodes beginning May 4 (8-9 p.m. ET).