TiVo Guide Week of April 19, 2010 *spoiler alert*

"Lost" The Locke monster's camp merges with Jack's, and alliances are forged (and broken). L.A. segments focus on Jack. Nadia: Andrea Gabriel. Tuesday at 9 on ABC.

"American Idol" One of the Top 7 singers is slated to be eliminated in an "Idol Gives Back" episode, which features performances by Alicia Keys, Carrie Underwood, Black Eyed Peas, Annie Lennox and Jeff Beck. The initiative raises funds for U.S. and global charities, including Children's Health Fund, Feeding America, Malaria No More, Save the Children's U.S. Programs and the United Nations Foundation. Wednesday at 9 on Fox.

"Bones" Human remains discovered inside a shark may be those of an aquarium's guest lecturer, but another interesting aspect of the investigation emerges when Brennan observes the predatory nature of a marine biologist (Rena Sofer) with her eye on Booth. Thursday at 8 on Fox.

"The Office" Andy goes to extremes to make sure Erin has a very special Secretary's Day. But it all could backfire thanks to Michael, who informs Erin about Andy's past relationship with Angela. Meanwhile, Oscar creates a viral video that highlights similarities between Kevin's voice and Cookie Monster's voice. Thursday at 9 on NBC.

"Star Wars: The Clone Wars" A young boy with a vendetta against the Jedi recruits bounty hunters to help him carry out his revenge plot. Friday at 9 on Cartoon.

"Explorer" Examining evidence that suggests Europeans believed in the existence of vampires in the 16th century. Included: a forensic investigation of a skeleton found in a mass grave near Venice, Italy, that had been subjected to a macabre vampire-killing ritual. Saturday at 7 on National Geographic.

"Saturday Night Live" Gabourey Sidibe hosts. MGMT perform. Saturday at 11:29 on NBC.

"Desperate Housewives" Flashbacks focusing on the Fairview Strangler show him intruding on Gaby and Carlos during an intimate moment, and being offered a job and dating advice by Bree. In addition, Susan is seen encouraging his interest in art, and Lynette shows him kindness. Sunday at 9 on ABC.