Here's a look at tonight's sci-fi TV:
Fringe, 'White Tulip' – It looks like the team is heading back to case-of-the-week territory with a guest appearance from Robocop himself, Peter Weller. Mr. Weller plays a mysterious time-traveling man connected to the deaths of commuter train passengers. (9 p.m. ET on Fox)
FlashForward, 'Let No Man Put Asunder' – Racing against the death clock, Demetri moves up his wedding date while Wedeck and Aaron attempt to rescue Tracy. (8 p.m. ET on ABC)
The Vampire Diaries, 'Under Control' - Genre TV vet David Anders (Heroes, 24) pays Elena and Jeremy a surprise visit. Elsewhere, Tyler ant Matt quarrel while Stephan tries to deal with the reprecussions of his time with the tomb vamps. (8 p.m. ET on The CW)
Supernatural, 'Point of No Return' – It's the 100th episode, and The CW promises it's gonna get wild for the Winchester boys! The angels turn the tables on the brothers and Zachariah reappears to cause some more damage. (10 p.m. ET on The CW)
Head after the jump for preview clips and more TV picks.