While several shows settle into their second episodes of the season, Neil deGrasse Tyson lends his voice to Gravity Falls and Lost returns for one night only—on Phineas and Ferb. Plus, Star Wars Rebels premieres and Korra returns for its final season. Get all the details below!

Top image from Dark Haul, Syfy's newest original movie. That's sibling love right there.

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Tonight

Phineas and Ferb (7:30 PM, Disney XD)

Lost co-creator Damon Lindelof plotted tonight's episode of Phineas & Ferb, which transplants the mysteries of the Island to Danville. It all starts when a mysterious capsule lands in our heroes' backyard, unleashing all manner of chaos. In the meantime, Perry learns that Doof has been kidnapped by Professor Mystery (Lost's Terry O'Quinn), another evil scientist.

Gotham (8 PM, Fox)

The series' second episode focuses on Selina Kyle when Gordon and Bullock investigate a child trafficking ring preying on Gotham's street kids. Meanwhile, Cobblepot makes his way to Gotham from the countryside, leaving victims in his wake.

Scorpion (9 PM, CBS)

Will the hacker show deliver another ridiculously idiotic scene? Well, considering this episode has the team dealing with a governor's daughter who has been "biohacked" with a deadly virus, the odds are high.

Sleepy Hollow (9 PM, Fox)

It's Franklinstein's monster! Abbie and Ichabod use Benjamin Franklin's creature in an attempt to rescue Katrina from Headless. Plus, Jenny butts heads with the new sheriff and Frank Irving has his own issues after he reveals the truth about his demonic encounter.

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Tuesday

Marvel's Agents of S.H.I.E.L.D. (9 PM, ABC)

Things are still looking dire for Coulson's team with General Talbot, Hydra, and Creel on the attack—and Coulson thinks the only way to save everyone is by putting them in the line of fire. At the same time, one member of the team is at risk thanks to Kyle MacLachlan's mysterious Doctor and a secret he harbors.

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Forever (10 PM, ABC)

While Henry wishes to age, New York's aging rich are hunting for the fountain of youth. But the potion they're shelling out for turns their brains to Swiss cheese and soon Henry and Jo see the dead bodies piling up. Unfortunately, Henry's pal Abe may be the next victim of this deadly snake oil.

Person of Interest (10 PM, CBS)

Finch says he's done with the numbers—until Reese comes across a person of interest involved in a potentially deadly scavenger hunt. That proves hard to resist.

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Also on tonight: There's another episode of Face Off, airing at 9 PM on Syfy.

Wednesday

Nature: Penguins: Spy in the Huddle (8 PM, PBS)

Celebrate hump day by indulging in footage of baby penguins: newborn Emperors in Antarctica, rockhopper chicks in the Falklands and Humboldt chicks in Peru.

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Thursday

Teen Titans Go! (6 PM, Cartoon Network)

Things gets ponified when Control freak zaps the Titans into an episode of Pretty, Pretty Pegasus and the team has to help the cutesy critters in order to get home.

Steven Universe (6:45 PM, Cartoon Network)

Greg injures his leg and comes to live with Steven, but ends up interfering with Steven's powers.

Haven (8 PM, Syfy)

How do you solve a problem like Mara? Dwight and Nathan go head-to-head as they try to figure out how to end the Trouble forever.

The Vampire Diaries (8 PM, The CW)

Elena has developed some…not so healthy coping mechanisms while mourning Damon's death, but now it's time of her to start sophomore year at Whitmore College—and she's going to be pretty surprised when she learns what Stefan has been up to. And it appears no one else is adjusting to the recent spate of changes particularly well, either. Matt worries that Jeremy's behavior has turned self-destructive in the wake of Bonnie's death. Tyler has to learn how to control his anger as a human being again. And Alaric is still dealing with his new vampiric state when he meets pretty doctor Jo.

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Friday

The Legend of Korra (Streaming, Nick.com)

The fourth (and final) season kicks off, and it will apparently show us some of Korra's recovery before launching us three years into the future.

Star Wars Rebels (9 PM, Disney)

The series, which bridges the gap between Revenge of the Sith and A New Hope, premieres with a one-hour pilot movie, introducing us to the Empire-hating crew of the Ghost and Ezra, a street urchin caught up in their proto-rebellion. Will it have some of that Clone Wars magic?

The Knick (10 PM, Cinemax)

The cocaine shortage already has Thackery feeling edgy—plus, he's afraid that Dr. Levi Zinberg is going to outshine him at a New York Surgical Society presentation. Meanwhile, Cornelia, Speight, and Bertie try to ensure Typhoid Mary will be forcibly quarantined.

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Z Nation (10 PM, Syfy)

This week, our survivors encounter something worse than zombies: a zombie army. Plus, we'll learn all about 10K's past.

Also on tonight: The third season premier of Teenage Mutant Ninja Turtles hits Nickelodeon at 8 PM.

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Saturday

Sailor Moon Crystal (Streaming, Hulu, Neon Alley, Crunchyroll)

This week, Usagi learns the identity of Tuxedo Mask and why he's looking for the Silver Crystal. Meanwhile, Zoisite hypnotizes the people of Tokyo.

Phineas and Ferb (8 PM, Disney)

The animated stepbrothers spoof Night of the Living Dead when Doofenshmirtz accidentally turns the denizens of Danville into contagious Doof-zombies.

Dark Haul (9 PM, Syfy)

The latest Syfy original movie involves a particularly monstrous family: "A team of secretive guardians transport a deadly creature and its half-human sister to a secure location, but the beast escapes and threatens to fulfill a prophecy - by destroying the world."

Doctor Who (9 PM, BBC America)

This episode, in which the Doctor and Clara deal with a world of horrors after crashing on the moon, was originally written for Matt Smith's Doctor. How will it translate to Capaldi?

Gravity Falls (9 PM, Disney)

Neil deGrasse Tyson gives voice to Waddles after eats a bowl of brain enhancing jelly and is able to speak for the first time. That's one of just three stories from this week; in the other two, Stan is cursed by a witch and Mabel must face her fear of Claymation.

Intruders (10 PM, BBC America)

Someone makes a gruesome discovery in Jack's backyard, which prompts Jack to make one last attempt to bring Amy home. Rose thinks a waiter has answers about her past—so she kidnaps him. Marcus gets closer to getting revenge on Rose, and Gary realizes that exposing the corruption behind Qui Reverti will require an unthinkable sacrifice.

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Sunday

Once Upon a Time (8 PM, ABC)

It looks like Elsa is freezing the boundaries of Storybrooke until she gets Anna back. Didn't we spend a whole movie learning that you're not a villain, Elsa?

Resurrection (9 PM, ABC)

Bellamy is reeling from the realization that he's Returned when he and Sheriff Fred realize someone is living in Caleb's old hunting shack. Plus, Janine decides to give her marriage to Pastor Tom another go and Mama Langston is pissed when she learns what became of the family business.

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The Witches of East End (9 PM, Lifetime)

The two-hour season finale finds the Beauchamps in 1840, when Freya encounters Edgar Allan Poe and Joanna tangles with a dangerous admirer. But by the end of the episode, the Beauchamps will lose one of their own.

Manhattan (10 PM, WGN)

Is there a spy, or is it all paranoia? "A development overseas invigorates the hunt for a spy on the Hill."

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The Strain (10 PM, FX)

Eph and Fet recon for an all-out assault that Setrakian assures them will finally kill the Master. Gus aligns himself with a strange new force, one that may swing the fight in an unforeseen direction.

Also on tonight: In addition to the weekly episodes of The Simpsons (8 PM) and Family Guy (9 PM), Fox is airing the season premiere of Bob's Burgers (7:30). Plus, Homeland's fourth season premieres on Showtime at 9 PM, and Adult Swim has new episodes of Mr. Pickles (11:30 PM) and Squidbillies (11:45 PM).

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