American Thanksgiving means a somewhat lighter week for television, but we've still got some big things happening with the the mid-season finales of Gotham and The Walking Dead. Plus, The Flash's Barry loses his powers and Person of Interest gets involved in power struggle for control of the city's gangs.

Update: There's also a bunch of new Adventure Time this week:

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Tonight

Gotham (8 PM, Fox)

While Selina leads new pal Bruce on a tour through Gotham and tries to evade the assassins on her trail, Gordon is assigned to duty at Arkham Asylum. This is the mid-season finale, so expect something dramatic from "Lovecraft."

The Originals (8 PM, The CW)

Rebekah's quiet, normal life with Hope is disrupted when she realizes Esther knows her whereabouts. Plus, Klaus devises a plan to turn his brothers against their mother.

Scorpion (9 PM, CBS)

The team has to recover the stealth technology from a military plane that was shot down in Bosnia before it falls into enemy hands.

Sleepy Hollow (9 PM, Fox)

Abbie and Ichabod seek out the Sword of Methuselah, a weapon that can supposedly kill Moloch—but will Headless be able to stop them?

Star Wars Rebels (9 PM, Disney XD)

We're picking up from last week's cliffhanger. Ezra and Kanan need to create a distraction to protect the Imperial deserter, but will we learn more about the info bomb he dropped at the end of the last episode?

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Tuesday

The Flash (8 PM, The CW)

After an encounter with Farooq, a.k.a. Blackout, Barry finds himself sapped of his super speed. The S.T.A.R. Labs team ends up needing to figure out how to protect themselves without the Flash's powers. Meanwhile, the Clock King stages a coup inside the police station, taking several people hostage.

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Phineas & Ferb (8 PM, Disney XD)

What happens after Doofenshmirtz is defeated? Well, a new threat from the 2nd Dimension emerges, and Candace and her resistance will have to help fight it.

Supernatural (9 PM, The CW)

Witchy redhead Rowena shows up on the Winchesters' radar after she steps in to handle a demon that's fleeing from Crowley. Meanwhile, Hannah has an encounter with someone from her vessel's life, complicating things with Castiel.

Person of Interest (10 PM, CBS)

Elias is targeted by Brotherhood leader Dominic, and Reese and Finch find themselves caught in a power struggle involving control of the city's street gangs. Plus, Root and Shaw disagree over how to handle a threat from Samaritan.

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Wednesday

Gravity Falls (8 PM, Disney XD)

Mabel takes matchmaking too far when she steals a love potion from a real Love God.

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The Making of Peter Pan Live! (8 PM, NBC)

If you're itching to watch NBC's live performance of the classic musical, you can whet your anticipation with this one-hour, behind-the-scenes special.

The Almighty Johnsons (11 PM, Syfy)

Axl finds that being Mr. Nice God isn't all its cracked up to be, and Ty tries to figure out a way to rid himself of his divine spirit.

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Thursday

Phineas & Ferb (8:30 PM, Disney XD)

Doofenshmirtz is sentenced to community service for his evil ways—and that means teaching science at the local high school, much to his daughter Vanessa's chagrin.

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The Almighty Johnsons (11:10 PM, Syfy)

A simple flu turns the Johnsons' lives upside down.

Friday

Helix Marathon (6 AM, Syfy)

Did you miss Syfy's infection drama Helix the first time around? Here's your chance to get caught up before the next season airs.

Legend of Korra (Streaming, Nick.com)

It looks like the Spirit vines are not too pleased with Kuvira's latest encroachment. But hey, Jon Heder's hipster Airbender is back!

Grimm (9 PM, NBC)

Nick has been debating whether it's worth becoming a Grimm again, but things start looking clearer now that Monroe and Rosalee have been attacked. Plus, Nick and Hank find themselves investigating a stretch of road that serves as the staging area for a grisly Wesen ritual.

Constantine (10 PM, NBC)

Last time that John Constantine tried to exorcise a child, it didn't go so well. But he'll have to try, try again when a boy is taken over by a malevolent spirit.

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Z Nation (10 PM, Syfy)

Murphy is kidnapped by a group of outlaws hoping to get inside the "Fort Knox of Oxycontin." The survivors have to battle drug-enhanced zombies—and learn something surprising about Murphy's abilities.

Saturday

Atlantis (9 PM, BBC America)

Ariadne is formally crowned queen, but with Pasiphae still at large and the city struggling in the aftermath of battle Atlantis remains vulnerable. But an enigmatic stranger arrives offering salvation.

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Sunday

Once Upon a Time (8 PM, ABC)

Now that the Snow Queen is casting her mirror spell, the denizens of Storybrooke will start turning on one another.

Resurrection (9 PM, ABC)

As anti-Returned rhetoric intensifies, Pastor Tom's new church proves a refuge while Bellamy and Sheriff Fred work to track down members of the True Living. Maggie is on the verge of finding a cure for the Returned virus—until a kidnapping and a hate crime bring everything to a halt.

The Walking Dead (9 PM, AMC)

It sounds like things are about to get bloody in Grady in the mid-season finale, "Coda": "New enemies disregard rules and morals; although Rick wants to find a peaceful agreement, the enemies seem to prefer a more violent resolution."

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