What to Watch: April 15

'Saturday Night Live in the 2000s: Time and Again' (9PM, NBC)
Former and current cast members, as well as great hosts like Justin Timberlake, Alec Baldwin and Christopher Walken, recall the best 'SNL' moments of the 2000s in this fun clip special, from 'Nick Burns, Your Company's Computer Guy' ("He'll fix your computer, but then he's gonna make fun of you") and 'Appalachian Emergency Room' ("What is it this time, Tyler?") to 'Deep House Dish' ("Ooowee, T'Shane!') and, of course, the instant classic 'D*ck in a Box,' which Timberlake discusses as a viral video he and co-star Andy Samberg had no idea would become such a pop culture phenomenon. There's also the political spoofs (Tina Fey as Sarah Palin and Fred Armisen as New Jersey-hatin' New York Governor David Paterson), Bill Hader's spot on Vincent Price and more Kristen Wiig than any 'SNL' fan needs, and, one of the series' all-time most famous skits, which viewers will remember with just two words: "More cowbell!"'Saturday Night Live in the 2000s: Time and Again' (9PM, NBC)
Former and current cast members, as well as great hosts like Justin Timberlake, Alec Baldwin and Christopher Walken, recall the best 'SNL' moments of the 2000s in this fun clip special, from 'Nick Burns, Your Company's Computer Guy' ("He'll fix your computer, but then he's gonna make fun of you") and 'Appalachian Emergency Room' ("What is it this time, Tyler?") to 'Deep House Dish' ("Ooowee, T'Shane!') and, of course, the instant classic 'D*ck in a Box,' which Timberlake discusses as a viral video he and co-star Andy Samberg had no idea would become such a pop culture phenomenon. There's also the political spoofs (Tina Fey as Sarah Palin and Fred Armisen as New Jersey-hatin' New York Governor David Paterson), Bill Hader's spot on Vincent Price and more Kristen Wiig than any 'SNL' fan needs, and, one of the series' all-time most famous skits, which viewers will remember with just two words: "More cowbell!"

'CSI' – Wow, our best high school field trip involved a smelly school bus, a brown bag lunch and sitting through a local opera production. Tonight, Wendy and Hodges lead some aspiring high school CSI-ers on a field trip that involves investigating an apartment building fire and a dead body. Score! (9PM, CBS)

'Fringe' – Peter Weller guest stars as Alistair Peck, a mysterious man with an abundance of energy and a curious connection to Peter and an odd commuter train accident in which the passengers were killed in still deaths. (9PM, Fox)

'Supernatural' – It may be their 100th episode, but there's no time for Sam and Dean to celebrate, 'cuz they've got their hands a bit full with averting a world war and thangs. (9PM, The CW)

'Ace of Cakes' – The cake: guitar-shaped. The episode title: 'Bake, Rattle and Roll.' Awesome. (10PM, Food Network)

'Project Runway' – It's part one of the season finale, and our money's still on Emillio to win. (10PM, Lifetime)

'Sarah Silverman Program' – Just how competitive is Sarah? She and her sister try to out-Holocaust memorial each other. (12AM Friday, Comedy Central) season 3 finale