What to Watch: Thursday, April 15

How far will partners Brian and Steve's prank go on the season finale of The Sarah Silverman Program? Thursday, April 15 8:00 pm Vampire Diaries, The CW (1 hr) NEW Elena and Jeremy have a surprise visitor, and there is drama between Matt and Tyler. Created by out screenwriter, Kevin Williamson.

Will bisexual forensic artist help solve this week's mystery??

8:00 pm FlashForward, ABC (1 hr) NEW Aaron infiltrates Jericho with Wedeck’s help, while Olivia and Lloyd’s friendship gets a little stronger. Also, after discovering that his death-date is near, Demitri rushes to plan his wedding with Zoey. Also features lesbian FBI agent, Janis. 8:00 pm Bones, Fox (1 hr) NEW There may be some similarities between a murder at Brennan’s school and a murder 15 years ago. Will bisexual forensic artist Angela be able to help them crack the case? 10:00 pm Project Runway, Lifetime (1 hr) SEASON FINALE: PART I The competition heats up with the first round of the finale! 12:00 am The Sarah Silverman Program, Comedy Central (30 min) SEASON FINALE Brian and Steve pull a prank, while Sara and Lara compete to create the best Holocaust memorial.