American Horror Story: Freak Show (10pm, FX) - The fourth installment of “American Horror Story,” which has a carnival sideshow-themed season set in Florida in 1952, begins with police making a grim discovery at a farmhouse. The Ryan Murphy Acting Ensemble are present and accounted for once again: Jessica Lange, Sarah Paulson, Frances Conroy, Kathy Bates, Evan Peters, Gabourey Sidibe, Denis O’Hare, Angela Bassett, etc. Based on the first two episodes, it looks like Murphy is once again going for gross-out over purely scary (much like last season’s “Coven”), with a huge, heaping dose of kinky. Oh, and if you’re one of the few people in the world not terrified of clowns, “Freak Show” should take care of that. Read the full review of “American Horror Story: Freak Show” (aka “Please Don’t Send in That Clown”).
Also on tonight . . .
Arrow (8pm, CW) - Season 3 begins with a new villain, Vertigo, emerging just as Oliver tries to balance his life and ask out Felicity. Meanwhile, Diggle becomes a father and Laurel joins Arrow’s inner circle. (If you missed “The Flash” last night, it’ll air again right after this.)
NOVA: Why Planes Vanish (9pm, UNC-TV) - The search for Malaysia Airlines Flight 370, which disappeared on March 8, 2014, is detailed. The report includes a look at how planes disappear and whether technological advances will eventually make it so that every plane can be located.
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Red Band Society (9pm, Fox) - Friendships start to form when Jordi starts his treatment. Also, Kara goes back to school and Emma attends her first dance.
Modern Family (9pm, ABC) - While editing Mitchell and Cameron’s wedding video, Phill discovers he’s to blame for a miserable cold that’s been plaguing the family.
Legends (9pm, TNT) - The season concludes with two new episodes. In the first, Martin escapes from an interrogation and discovers that Sonya and Aiden have been abducted. In the finale, Martin learns that Verax may be plotting an assassination, and later, Martin makes a shocking discovery about his own identity.