Without Warning (Friday, April 26, 8 p.m., CBS/Ch. 2): Dick Van Dyke returns in a "Diagnosis: Murder" movie.
50 Years from Television City (Saturday, April 27, 7 p.m., CBS/Ch. 2): Burnett is back to host this one, which looks at shows ranging from her own to "All in the Family" to "The Price Is Right," all of which originated from CBS Television City.
Everybody Loves Raymond: The First Six Years (Sunday, April 28, 7 p.m., CBS/Ch. 2): It's nostalgia about a show that's still on the air.
Weakest Link (Sundays, 7 p.m., NBC/Ch. 5): On April 28, it's TV moms; May 12, it's stars from "L.A. Law"; May 19, it's stars from "The Monkees," "The Cosby Show," "Star Trek," "The A-Team" and "McCloud."
Gilda Radner: It's Always Something (Monday, April 29, 8 p.m., ABC/Ch. 4): TV movie about the life and death of the "Saturday Night Live" star.
Crossing Jordan (Monday, April 29, 8 p.m., NBC/Ch. 5): Jack Klugman, who played a coroner on "Quincy, M.E." from 1976-83, plays a coroner (not Quincy) in this series about a coroner (Jill Hennessy).
Bob Hope's Funniest Out-Takes (Tuesday, April 30, 7 p.m., NBC/Ch. 5): Kelsey Grammer hosts this collection of clips.
Frasier (Tuesday, April 30, 8 p.m., NBC/Ch. 5): Frasier is reunited with former "Cheers" buddies Carla (Rhea Perlman), Cliff (John Ratzenberger) and Norm (George Wendt).
Scrubs (Tuesday, April 30, 8:30 p.m., NBC/Ch. 5): "St. Elsewhere" alumni Ed Begley Jr., William Daniels, Stephen Furst and Eric Launeville guest star.
The Tonight Show with Jay Leno 10th Anniversary Special (Tuesday, April 30, 9 p.m., NBC/Ch. 5): Leno's first prime-time special.
Providence (Friday, May 3, 7 p.m., NBC/Ch. 5): "Little House on the Prairie" star Melissa Gilbert guest stars.
American Bandstand's 50th . . . a Celebration! (Friday, May 3, 7 p.m., ABC/Ch. 4): Dick Clark hosts this two-hour special.
NBC 75th Anniversary Special (Sunday, May 5, 7 p.m., NBC/Ch. 5): Star-studded, three-hour extravaganza will air live (tape-delayed in this time zone) and will feature hosts Tom Brokaw, Bill Cosby, Katie Couric, Kelsey Grammer, Matt Lauer, Jay Leno and Jerry Seinfeld.
Third Watch (Monday, May 6, 8 p.m., NBC/Ch. 5): Former "Hill Street Blues" stars Veronica Hamel, Bruce Weitz and Ed Marinaro guest star.
The Honeymooners 50th Anniversary Celebration (Monday, May 6, 9 p.m., CBS/CH. 2): Norton himself, Art Carney, will appear in this special.
Laverne & Shirley Together Again (Tuesday, May 7, 7 p.m., ABC/Ch. 4): A look back at this hokey 1976-83 series.
Favorite Stars: Then and Now (Tuesday, May 7, 8 p.m., ABC/Ch. 4): Celebrity stuff from the E! channel.
L.A. Law: The Movie (Sunday, May 12, 8 p.m., NBC/Ch. 5): Cast members from the 1986-94 series reunite for the TV movie.
Mary Tyler Moore Reunion (Monday, May 13, 9 p.m., CBS/Ch. 2): Moore and the surviving cast members reminisce and introduce clips from the 1970-77 series.
50 Best Shows of All Time (Monday, May 13, 9 p.m., ABC/Ch. 4): As chosen by TV Guide.
NBC's Funniest Out-Takes (Tuesday, May 14, 9 p.m.; and Tuesday, May 21, 7 p.m., NBC/Ch. 5): Not just one but two shows featuring bloopers from past and current programs.
The Cosby Show: A Look Back (Sunday, May 14, 8 p.m., NBC/Ch. 5): Retrospective of the 1984-92 show that revived the sitcom format.
20 Years of Must-See Television (Monday, May 20, 8:30 p.m., NBC/Ch. 5): A 90-minute look back at NBC's Thursday-night shows, including "Hill Street Blues," "L.A. Law," "ER," "The Cosby Show," "Cheers," "Family Ties," "Seinfeld," "Friends" and more.
That's Incredible! (Tuesday, May 21, 7 p.m., ABC/Ch. 4): Hosts John Davidson, Cathy Lee Crosby and Fran Tarkenton return to highlight this popular 1980-89 series that, in some ways, helped kick off the reality format.