TV THIS WEEK: It's a Walking Dead finale, Diaries returns and more!

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Dec 17, 2012, 3:16 PM EST

The Walking Dead chomps through its season-two finale, The Vampire Diaries flashes Damon back to 1912, and Face Off declares a winner. We also have the Star Wars: The Clone Wars season finale and the premiere of Ugly Americans.

Also this week, the team tracks a man who was innocent in Alcatraz, Sally gets a Reaper lesson on Syfy's Being Human, a banshee predicts a death on Lost Girl, the crew faces off against a cannibalistic entity on The River, Ghost Hunters International digs into Mayan ruins, Cassie's suspicions about her father grow on The Secret Circle, Michael's son is kidnapped on Awake, Dean gets cursed on Supernatural, Arthur decides to marry a princess on Merlin, the roommates meet a ghost from the 1970s on BBC America's Being Human, Syfy celebrates St. Patrick's Day with a Leprechaun's Revenge, and Mary Margaret is arrested for murder on Once Upon a Time.

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

Monday, March 12

Alcatraz (Fox) 9 p.m. - "Clarence Montgomery"

Postponed from two weeks ago. The team tracks the crime spree of a returning 63 who may have been innocent when he went to Alcatraz. The 4400's Mahershala Ali guest-stars as Clarence Montgomery.

Here's a preview:

Being Human (Syfy) 9 p.m. - "When I Think About You I Shred Myself"

Sally learns a lesson about being a Reaper, Josh gets a visit from an old friend, and Aidan attempts to save Henry.

Here's a sneak peek:

Lost Girl (Syfy) 10 p.m. - "Fae Day"

Bo's Fae education continues when a banshee's cry interrupts a Fae holiday warning of an impeding death, leading Bo on a mission to resolve a family feud.

Here a sneak peek:

Tuesday, March 13

The River (ABC) 9 p.m. - "The Experiment"

In the penultimate episode, the crew's search for Emmet takes them to an abandoned research facility, and into the path of a cannibalistic entity.

Here's a preview:

Other Tuesday shows of interest:

On the Science Channel's Alien Encounter (10 p.m.), scientists and science fiction writers speculate how the human race would deal with a message from space in "The Message."

Wednesday, March 14

Ghost Hunters International (Syfy) 9 p.m. - "Sacrified Mayan Spirits: Belize & France"

The ghost hunters head to San Ignacio, Belize, to investigate the Mayan ruins of Cahal Pech, where Susan attempts to contact the spirits.

Here's a promo:

Face Off (Syfy) 10 p.m. - "The Ultimate Spotlight Challenge"

Season-two finale! The three finalists are tasked with developing three original characters from the horror, sci-fi or fantasy genre who will perform a dance routine at the Alex Theatre in Glendale, Calif.

Here's a preview:

Other Wednesday shows of interest:

On Comedy Central's Ugly Americans (10:30 p.m.), when a miniature arsonist escapes up Twayne's nose, Mark and the gang shrink themselves to lead a manhunt inside Twayne's body in "Journey to the Center of Twayne."

Thursday, March 15

The Vampire Diaries (The CW) 8 p.m. - "1912"

Returns with new episodes and Cassidy Freeman! Damon recognizes a pattern in a crime spree that is similar to murders in 1912. Sounds like a good excuse for a flashback. Elsewhere, Elena and Matt dig into the possibility that Dr. Fell may be the killer. Smallville's Cassidy Freeman guest-stars.

Here's a promo:

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

Returns with new episodes! Cassie is suspicious of Blackwell when she finds him searching for something, and Faye meets a woman who may be Lee's girlfriend. Meanwhile, Diana considers dating a normal guy.

Here's a look:

Awake (NBC) 10 p.m. - "Guilty"

Michael's sanity is questioned when his son is kidnapped by an escaped convict he once arrested in one reality, and a teenager vanishes in the other reality.

Here's a look:

Other Thursday shows of interest:

On part one of FX's two-part season finale of Archer (10 p.m.), the gang heads into space to stop a catastrophe on the International Space Station in "Space Race, Part 1." And on ABC's Grey's Anatomy, we learn a little more about Summer Glau's character, Emily, when she works with a suspicious Christina in "One Step Too Far."

Friday, March 16

Supernatural (The CW) 9 p.m. - "Out With the Old"

Is that Castiel we see in the preview? In the episode, some cursed ballet slippers force a ballerina to dance herself to death, which doesn't bode well for Dean when he touches the blasted things.

Here's a preview:

Merlin (Syfy) 10 p.m. - "The Hunter's Heart"

Gwen ends up at odds with Morgana, who's plotting with a warlord in her latest scheme to take Camelot. Elsewhere, Arthur decides to marry a princess from a nearby kingdom.

Here's a look:

Other Friday shows of interest:

On the Cartoon Network's season-four finale of Star Wars: The Clone Wars (8 p.m.), Obi-Wan and Asajj team up when Maul and Savage go after "Revenge." On The CW's Nikita (8 p.m.), Nikita makes a deal in "Doublecross." On the Travel Channel's Ghost Adventures (9 p.m.), UFC fighter Brendan Schaub joins the guys as they investigate a murder at Denver's "Peabody-Whitehead Mansion." And on Spartacus: Vengeance (10 p.m.), Spartacus considers revenge in "Balance."

Saturday, March 17

Being Human (BBC America) 9 p.m. - "A Spectre Calls"

A ghost from the 1970s causes trouble.

Here's a look:

Chasing Leprechauns (Hallmark) 8 p.m.

In this TV film, Heroes' Adrian Pasdar stars as a corporate fixer who is faced with having to deal with the local Irish population when it comes to a job site that just may be the home of leprechauns ... and not the killer kind, most likely.

Here's a preview:

Leprechaun's Revenge (Syfy) 9 p.m.

You just got to love it when an evil leprechaun is accidentally unleashed on a small town, and he's none too happy with the townfolk who are descendants of the settlers who stole his gold.

Here's a promo:

Saturday, March 18

Once Upon a Time (ABC) 8 p.m. - "Heart of Darkness"

When Emma arrests Mary Margaret for Kathryn's murder, she turns to Mr. Gold for legal help. Elsewhere, in the fairy-tale world, Prince Charming puts a crimp in Snow White's plot to take out the Evil Queen.

Here's a preview:

The Walking Dead (AMC) 9 p.m. - "Beside the Dying Fire"

Season-two finale! Wow! Well, Rick's shocking deed, a nervous group of survivors back at the house and a herd of you-know-whats headed their way ... It looks like it's going to be one doozy of a finale.

Here's a look and a sneak peek:

Other Sunday shows of interest:

On AMC's Talking Dead (10 p.m.), actress Laurie Holden and executive producers Glen Mazzara and Robert Kirkman discuss The Walking Dead season finale live.

What are you going to watch?