TV THIS WEEK: Fringe, Supernatural, Big Bang premieres and more!

It's premiere week the sequel, and, boy, is it busy as we get the season-four (where's Peter?!) premiere of Fringe, a season-seven (Cass is God?!) premiere of Supernatural, a season-five (Penny and Raj?!) premiere of The Big Bang Theory and new series premieres of CBS's mathematical adventure Person of Interest and the ghostly A Gifted Man.

We also have the season-four finale of Eureka, the season-three finale of Drop Dead Diva, the season-two premiere of Nikita, the season-five premiere of Ghost Adventures, and the series premieres of the Travel Channel's The Dead Files and TLC's Long Island Medium.

Beyond all that, Pete and Myka encounter zombies on Warehouse 13, the Alphas may have a traitor in their midst, the Ghost Hunters explore Pittsburgh's Carnegie Library, Klaus gets wolfy on The Vampire Diaries, Cassie tries life without magic on The Secret Circle, Archer goes Pirate King, people get mummified on Haven, it's "Closing Time" for the Doctor on Doctor Who and David Hewlett and Robert Picardo battle Syfy's Morlocks.

Here's what we have to look forward to this week on sci-fi, fantasy, paranormal and spy-fi TV.

Monday, Sept. 19

Eureka (Syfy) 8 p.m. - "One Giant Leap"

Season-four finale! As the Astraeus mission preps for launch, those leaving say their goodbyes. Meanwhile, Carter and Jo must deal with an attack on the presidential convoy, and cosmic anomalies menace Eureka. Dave Foley joins the enormous list of guest stars, which includes Matt Frewer, Felicia Day, Wil Wheaton and Ming Na. And one more note: For a show that's been canceled there's a lot more Eureka to come, with a holiday episode in December and an entire season to premiere next summer.

Here's a preview and a sneak peek:

Warehouse 13 (Syfy) 9 p.m. - "Insatiable"

It's a zombie-licious episode when Pete and Myka track a walking-dead-type outbreak involving a 19th-century mason jar in a taco truck. Meanwhile, Claudia tries to contact Steve Jinks, who gets a proposition from Marcus Diamond.

Here's a promo and a sneak peek:

Alphas (Syfy) 10 p.m. - "The Unusual Suspects"

Could one of the Alphas be a traitor? The team is held at the Binghamton facility when one of the group is suspected of being an agent of Red Flag.

Here's a preview:

Other Monday shows of interest:

On MTV's Death Valley (10:30 p.m.) the team must deal with a werewolf attack at an adult-film shoot.

Wednesday, Sept. 21

Ghost Hunters (Syfy) 9 p.m. - "Ghost of Carnegie"

TAPS investigates the historic Carnegie Library in Pittsburgh, which has reports of slamming doors, apparitions and disembodied voices.

Here's a promo:

Dark Matters: Twisted But True (Science) 10 p.m. - "It's Alive; Tripping with Uncle Sam; My Hand Is Killing Me"

It's another creepy installment, hosted by Fringe's own mad scientist, John Noble. In this episode, it's a look at a 19th-century attempt at reanimating a dead corpse, an outbreak of madness in the 1990s and a condition called alien hand syndrome.

Here's a look:

Other Wednesday shows of interest:

On Syfy's Paranormal Witness (10 p.m.), a California family find themselves being attacked by a nasty poltergeist, and a former deputy sheriff has a run-in with a mysterious creature in the Oregon wilderness in "The Poltergeist/Watched in the Wilderness."

Thursday, Sept. 22

The Big Bang Theory (CBS) 8 p.m. - "The Skank Reflex Analysis" and "The Infestation Hypothesis"

It's a BIG two-episode season-five premiere! Penny hits bottom after sleeping with Raj, and Sheldon leads a paintball team in the first of two new episodes. And then Amy finds herself caught in the middle when Penny and Sheldon have a disagreement, and Leonard tries to find a way to continue his long-distance romance with Priya.

The Vampire Diaries (The CW) 8 p.m. - "The Hybrid"

Klaus uses a werewolf to increase his power while Damon battles a new enemy. Meanwhile, Tyler has a run-in with his mother, which we're just guessing has something to do with what she did to Caroline last week.

Here's a preview:

The Secret Circle (The CW) 9 p.m. - "Bound"

In the new hit series' second episode, Cassie avoids witchcraft and tries to live a magic-free life by making a non-witch friend, and Diana worries that the circle's powers are becoming uncontrollable. Meanwhile, Adam battles his feelings for Cassie.

Here's a promo:

Person of Interest (CBS) 9 p.m. - "Pilot"

New series premiere! Lost's Michael Emerson and Jim Caviezel star in this new series that takes place "five minutes in the future," involving a billionaire software genius (Emerson) and a presumed-dead ex-CIA agent (Caviezel) who try to use a computer program to stop crimes before they happen. First up, a young prosecutor becomes a person of interest to the team.

Here's a preview:

Archer (FX) 10 p.m. - "Heart of Archness, Part 2"

Part two of a three-parter! It's a tropical island adventure when Archer becomes the Pirate King. Meanwhile, ISIS tries to rescue him.

Other Thursday shows of interest:

On the History Channel's Ancient Aliens (10 p.m.), it's a look at the possibility that advancement in weaponry has been influenced by aliens in "Aliens and Deadly Weapons."

Friday, Sept. 23

Star Wars: The Clone Wars (Cartoon Network) 8 p.m. - "Prisoners"

Riff Tamson captures the Republic and Gungan armies. Meanwhile, Ahsoka and Prince Lee-Char struggle to rally the people of Mon Calamari in an effort to battle the Separatist invaders.

Here's a look:

A Gifted Man (CBS) 8 p.m. - "Pilot"

New series premieres! When brilliant neurosurgeon (Patrick Wilson) begins to see the ghost of his dead ex-wife (Jennifer Ehle), his life is turned upside down. Things get even more complicated when she asks him to give her computer password to the people running the low-income clinic she worked at so they can get into her computer.

Here's a promo:

Nikita (The CW) 8 p.m. - "Game Change"

Season-two premiere! Nikita and Michael plot to take down Division and Oversight with the black box. Meanwhile, Amanda is in charge of Division, and she convinces Alex to join her in tracking down the renegade spies.

Here's a look:

Supernatural (The CW) 9 p.m. - "Meet the New Boss"

Season-seven premiere! Picking up where the shocking finale left off, team Winchester faces a vengeful God, who just happens to be Castiel. Meanwhile, Sam has to deal with the crumbling wall in his head that had protected him from his memories of hell, and Dean asks Death to help him stop Castiel.

Here's a preview:

Fringe (Fox) 9 p.m. - "Neither Here Nor There"

Season-four premiere! The action picks up a week after Peter vanishes, and while the two universes attempt to hang on to an uneasy alliance, our Lincoln Lee joins the Fringe team when they run into a shape-shifting case. Seth Gable joins the cast as a regular, while the word is that we'll be seeing a whole lot less of Joshua Jackson as Peter Bishop.

Here's a look:

Haven (Syfy) 10 p.m. - "Business as Usual"

Now that the Rev is dead, who's going to be the Big Bad? It looks like it's going to be a big mythology episode as Audrey, Duke and Nathan all learn pieces of their past. Meanwhile, Audrey and Nathan probe murders involving mummified victims. WWE Superstar Edge, who's had an outstanding arc this season on the show, guest-stars.

Here's a sneak peek:

Other Friday shows of interest:

On the Cartoon Network, there's new episodes of Batman: The Brave and the Bold (6 p.m.), Young Justice (6:30 p.m.), Generator Rex (7 p.m.) and Ben 10: Ultimate Alien (7:30 p.m.). On the season-five premiere of the Travel Channel's Ghost Adventures (9 p.m.), the teams explores the Ashmore Estates in Illinois. And on the channel's new series The Dead Files (10 p.m.), retired homicide detective Steve DiSchiavi and psychic communicator Amy Allan lead separate investigations of a haunted farmhouse in rural New York before coming together for a big reveal in "Evil in Erieville - Erieville, NY."

Saturday, Sept. 24

Doctor Who (BBC America) 9 p.m. - "Closing Time"

When the Doctor stops by for a visit with an old friend, a silver rat in a department store leads to trouble. Based on the promo, we're thinking the Doctor just might have a run-in with a familiar enemy.

Here's a look:

Morlocks (Syfy) 9 p.m.

Stargate's David Hewlett and Robert Picardo star in this Syfy original movie that offers a new take on those bad guys from The Time Machine who've figured out how to travel to the present.

Here's a promo:

Sunday, Sept. 25

Drop Dead Diva (Lifetime) 9 p.m. - "Change of Heart"

Season-three finale! This one looks like a game-changer for the series. Jane and Kim take the case of a death-row inmate who wants to donate his heart to his dying sister, and Stacy asks for Grayson's help. Meanwhile, Jane gets an offer to go to New Zealand for a sailing adventure.

Here's a preview:

Other Sunday shows of interest:

On Discovery's Curiosity: Atlantis Uncovered (8 p.m.), scientists explore the destruction of the Atlantis. And on the two-episode series premiere of TLC's Long Island Medium (10 and 10:30 p.m.), real-life psychic medium Theresa Caputo balances her personal life with her family and her work with clients who attempt to connect with loved ones who've crossed over.

What are you going to watch?

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