The casts of several of the most iconic comedy series of all time will be participating on NBC's special "Must See TV: An All-Star Tribute to James Burrows," which will air Sunday, February 21 from 9:00 p.m-11:00 p.m. ET/PT. Burrows is recognized as TV's most accomplished comedy director. He made his TV-sitcom directing debut with a 1974 episode of "The Mary Tyler Moore Show." He is probably best known for his work on "Taxi," "Cheers," "Frasier" and "Will & Grace," which collectively earned him 10 Emmy Awards and four DGA Awards. He directed the pilots for all four series, as well as for such other long-running comedies as "Friends," "The Big Bang Theory," "Two and a Half Men" and "Mike & Molly." The February 21 special will celebrate Burrows' 1,000th episode with his new NBC comedy "Crowded," for which he also serves as an executive producer. "There is nobody with better TV comedy instincts than Jimmy Burrows, and because of his guiding hand these remarkable shows will be forever celebrated and stand the test of time," said Paul Telegdy, President, Alternative and Late Night Programming, NBC Entertainment. "The caliber of talent joining us to celebrate Jimmy's accomplishments is a testament to his imprint in television history." Scheduled to be in attendance will be the casts of the following shows. Others may also be added. Cheers - Ted Danson, Shelley Long, Bebe Neuwirth, Rhea Perlman, John Ratzenberger, George Wendt (Kirstie Alley, Woody Harrelson in pre-taped segments) Friends - Jennifer Aniston, Courteney Cox, Lisa Kudrow, Matt LeBlanc, David Schwimmer (Matthew Perry in pre-taped segment) Frasier - Peri Gilpin, Jane Leeves, David Hyde Pierce (Kelsey Grammer in pre-taped segment) Will & Grace - Sean Hayes, Eric McCormack, Debra Messing, Megan Mullally Taxi - Tony Danza, Danny DeVito, Marilu Henner, Judd Hirsch, Carol Kane, Christopher Lloyd The Big Bang Theory - Kaley Cuoco, Johnny Galecki, Simon Helberg, Jim Parsons Wings - Tony Shalhoub, Steven Weber Mike & Molly - Billy Gardell, Melissa McCarthy, Katy Mixon, Nyambi Nyambi, Reno Wilson Two and a Half Men - Jon Cryer, Charlie Sheen Crowded - Carlease Burke, Stacy Keach, Carrie Preston, Mia Serafino, Patrick Warburton Others in attendance include JB Smoove, Jason Bateman, Valerie Bertinelli, Kate Flannery and Will Arnett. Bob Newhart will participate in a pre-taped segment. Universal Television, Hazy Mills and Irwin Entertainment will produce. Sean Hayes, Todd Milliner and John Irwin are executive producers.