What's on When: Current Shows

Summary: Jaime Sommers (Michelle Ryan) was implanted with bionics after a car crash by a secret government cybernetics program; now she works for them, but on her own terms. When it's on: Now showing season 1 Wednesdays at 9 p.m. on NBC.

Summary: Chuck (Zachary Levi), a tech working for a retail computer-service outfit called Nerd Herd, unsuspectingly downloaded the contents of a top-secret government spy database, which was then destroyed. Government agents Sarah and John are forced to work with Chuck and help him to make connections only he, with his brain full of secrets, can make. When it's on: Airs Monday nights at 8 p.m. on NBC.

Summary: Young athlete Flash Gordon (Eric Johnson) though his dad died in an accident ten years ago, but in fact Dr. Gordon was drawn through a wormhole to the planet Mongo. Now, Mongo's overlord, Ming, is trying to establish stable rifts between the two worlds, while Flash, his ex-girlfriend Dale, and Dr. Gordon's assistant, Dr. Zarkoff, try to stop him while keeping the rift technology themselves secret from everyone on Earth. When it's on: Flash Gordon is on Fridays at 9 p.m. on Sci Fi.

Summary: Ordinary people find that they have special powers, but there's a dark side: on the one hand are sociopaths like Sylar (Zachary Quinto), and on the other hand a secret organzation called the Company is tracking and trying to control people with powers around the world. When it's on: Now showing season 2 on Mondays at 9 p.m. on NBC.

Summary: Reporter Dan Vassar (Kevin McKidd) suddenly finds himself travelling back in time, tracking people in the past who need help. This places a strain on his relationship with his wife and son, his brother, and his boss. When it's on: Airs Mondays at 10 p.m. on NBC.

Summary: Mick St. John (Alex O'Loughlin) is a vampire who's decided to use his powers to help people. Recently he's been working with Beth, a reporter whom he once saved from another vampire -- his ex-wife. When it's on: Airs Friday nights at 9 p.m. on CBS.

Summary: Ned (Lee Pace) can bring people back to life by touching them; but if he doesn't return them to death by touching them again within a minute, someone else nearby dies instead. He helps his business partner, a p.i. named Emerson, by touching murder victims and asking them who killed them; but complications arise when he leaves alive his childhood sweetheart, Chuck (Anna Friel). When it's on: Airs Wednesdays at 8 p.m. on ABC.

Summary: Underachiever Sam (Bret Harrison) found out that his parents sold his soul to the devil before he was born. Now he has to work as a bounty hunter for Hell, tracking down escaped soul and returning them to perdition. When it's on: Airs Tuesdays at 9 p.m. on The CW.

Summary: Young Clark Kent (Tom Welling) finds his way as a superhero, balancing his desire to help people with his love for Lana Lang and his complex relationship with former friend and budding villain Lex Luthor. When it's on: Currently showing season 7 Thursdays at 8 p.m. on The CW.

Summary: Stargate Command has sent an expedition to the Pegasus Gallery to expand Earth's knowledge of the universe and network of friends. Unfortunately, the Pegasus Galaxy is dominated by the Wraith, who cull the human inhabitants of most of the worlds that the expedition comes in contact with. When it's on: Now showing season 4 Fridays at 10 p.m. on Sci Fi.

Summary: Sam and Dean Winchester (Jared Padalecki and Jensen Ackles) inherit from their father the job of hunters for evil spirits. As they grow into their job, however, the brothers are faced with an escalating threat from hell that verges on breaking out into a full-fledged war between good and evil. When it's on: Currently showing season 3 Thursdays at 9 p.m. on The CW.

Summary: Jack Harkness (John Barrowman) leads a secret team that helps to defend the Earth from alien threats in this spin-off from the long-running British hit Doctor Who. When it's on: Showing the first season Saturdays at 9 p.m. on BBC America.