This week Stargate Universe shoves campy space comedy in the back seat for an ultra-violent premiere. But will you remain a loyal Gater? Sarah Palin becomes president on Supernatural, and Brian Austin Green makes his shirtless Smallville cameo.

Television's best holiday celebration is at hand: Shark Week! Stuff your brains with knowledge of the ultimate sea beast. True Blood's Jessica takes the spotlight, Being Human's ghost figures out why she's in limbo, and Stargate's Sheppard is back, sorta.