We say a big farewell this week to one of our favorite shows, The Legend of Korra, which ends after four seasons with a huge, mecha-filled battle. Plus, Syfy introduces its new miniseries, Ascension, set 50 years after JFK launches a generation ship into space. Get sneak peeks at the rest of this week's TV right here!

Top image: Ascension promo artwork by Alex Brady.

Tonight

Ascension (9 PM, Syfy)

Syfy's latest miniseries asks the question: what if a generation ship left Earth in the 1960s? Fifty years after JFK sent a ship into space to preserve humanity in the event of a nuclear war, Ascension experiences its first murder. While the crew of the ship starts to question Ascension's mission, we get to see Battlestar Galactica's Tricia Helfer in cool 1960s fashions.

Scorpion (9 PM, CBS)

How do the super geniuses celebrate the holidays? By working to save a boy trapped in a beach cave who is in imminent danger of drowning. Festive.

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Tuesday

Elf: Buddy's Musical Christmas (8 PM, NBC)

Jim Parsons of The Big Bang Theory takes on Will Ferrell's role in the animated adaptation of the Broadway musical adaptation of the Elf film. (It's adaptation telephone.) But hey, at least Ed Asner still voices Santa Claus.

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Ascension (9 PM, Syfy)

Naturally, we don't have a lot of details about night two of Ascension, but rumor has it, we'll see the fallout from a major twist.

Person of Interest (10 PM, CBS)

What happens on a day without crime in New York City? Samaritan takes control of the city in order to force the Machine out of hiding.

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Wednesday

The 100 (9 PM, The CW)

Finn will have to deal with his crimes after Clarke returns to Camp Jaha, while we learn about his relationship with Raven in a flashback aboard the Ark.

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Ascension (9 PM, Syfy)

The three-night event comes to a close. Hopefully, it will leave us all satisfied and basking in the retrofuturistic glow.

American Horror Story: Freak Show (10 PM, FX)

Elsa tells us the history of the freak show, while Pepper has a troubling reaction to the death of a performer and Debbie grows suspicious of Maggie.

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Thursday

The Almighty Johnsons (11 PM, Syfy)

It's the day of Gaia's 21st birthday. Which goddess path will she end up traveling?

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Friday

The Legend of Korra (Streaming, Nick.com; 10 PM, Nicktoons)

Aaaaaaaaaaahh! The final two episodes of Korra, ever, air Friday. What will happen when Korra faces off against Kuvira? What will happen to the Earth Kingdom/Empire? How will we survive without the Avatar universe in our lives?

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Saturday

Atlantis (9 PM, BBC America)

The mid-season finale finds Jason engaging with some of the most enigmatic figures of Greek mythology:

Ariadne is close to death and Jason's guilt is almost too much to bear. He becomes determined do all he can to save her and leaves on a dangerous quest into the unknown. Following an encounter with the ancient Grey Sisters, his mission sees him coming full circle, bringing him face to face with Medea and Pasiphae again.

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Sunday

The Librarians (8 PM, TNT)

Of course, in the world of The Librarians, Santa is real and the Serpent Brotherhood wants to kill him. But in rescuing Santa, the Librarians will have to discover the true, secret nature of Christmas.

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