warehouse 13 Allison Scagliotti-Smith claudiaThe soapy Defying Gravity sinks, Warehouse 13 gets a boost from a spunky new cast member, and a spaceship touches down on Eureka in this week's dose of sci-fi TV. Click through for more picks and preview videos.

Warehouse 13, "Burnout" - I still have problems with the show's formulaic structure and its dull mystery plots, but thankfully Allison Scagliotti-Smith is shaking things up a bit as newbie whiz kid Claudia. With "Burnout," Pete and Myka dig little deeper into the history of the Warehouse and find that a former agent didn't get the chance to finish his assignment. (Tuesday, 9 p.m. on SyFy.)

, "Ship Happens"
- Last week, Eureka went all Close Encounters with the outer space signal getting stronger and people on the ground preparing for its landing. This week, Henry's old project comes home with a visitor, but is she a friendly E.T. or more like Natasha Henstridge in Species? (Friday, 9 p.m. on Syfy.)

Being Human
, "Episode 4" –
Mitchell and George have similar problems this week. Mitchell befriends a 12-year-old and his mother but spooks the kid when he vamps out. George decides its time to tell Nina that he's a werewolf. (Saturday, 9 p.m. on BBC America.)

Defying Gravity, "H2IK" - We were promised sci-fi, but Defying Gravity is little more than a sappy soap set in space. Last night's ep, which was supposed to be about the crew undergoing cellular and psychological transformations, reminded us that everyone on the Antares crew has slept with everyone else and that they're all probably gonna do it again. And again. And again. What's with "Beta," the mysterious force controlling the mission? Apparently it's goal is to make the crew re-enact episodes of Private Practice while in orbit. This week, the crew deals with a massive systems failure. (Speaking of failure, the show is tanking in the ratings.) (Sunday, 10 p.m. on ABC.)