Tonight's Picks: Monday, May 12

First of the two-part season finale of "House" finds him surviving a bus crash but afflicted with a patch of amnesia in addition to his leg problem, drug addiction and misanthropy. The must-see of the night.

Low-rated but entertainingly sleazy "Gossip Girl" tonight finds Serena's past coming back to haunt her. Oh, and Lisa Loeb.

On "How I Met Your Mother,"  Britney Spears returns as Abby, and she and Barney go to the bar together just to tick off Ted.