TONIGHT'S MUST-SEE

"My Name is Earl" (7 p.m.), "The Office" (7:36 p.m.) and "30 Rock" (8:20 p.m.); all NBC. Tonight has three "supersized" episodes. First, Earl remembers when he "robbed a stoner blind." But the stoner (Christian Slater) won't let him off easy; Earl must live in a commune for an eco-friendly week. Then "The Office" has the Scranton and Stamford branches merging. That means Jim and Pam are finally back in the same room. And "30 Rock" — an uneven but clever show — moves to the night where it belongs. This centers on Tina Fey as a TV producer. Tonight, she's supposed to slip more GE products into the show; she promptly puts Jack (Alec Baldwin), the GE guy, into a sketch.

OF NOTE

" 'Til Death," 7 and 7:30 p.m., Fox. First is a new episode in which the couples share a getaway; Stephanie inexplicably has an erotic dream about her neighbor Eddie (Brad Garrett). Then, in a rerun, Eddie must use his woodworking equipment or lose it.

"Ugly Betty," 7 p.m., ABC. Everyone tries to get into the Thanksgiving spirit. Even Wilhelmina makes a passing attempt at cooking a turkey.

"Grey's Anatomy," 8 p.m., ABC. George is visited by his parents. Meanwhile, Meredith tries to be positive, and Derek and Addison try to be civil.

"CSI: Crime Scene Investigation," 8 p.m., CBS. This is taking shared experience too far: Identical twins who didn't know the other existed. Then each is killed on the same night.

"Shark," 9:01 p.m., CBS. A black teen is killed while leaving a party mainly attended by rich white kids, including Stark's daughter.

"ER," 9 p.m., NBC. Gates, Abby and Neela must quickly solve the mystery ailment running through a group of kids. Meanwhile, an emergency has Weaver tapping her medical skills.