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In the second-to-last episode of a surprisingly strong season of "Survivor" (7 p.m., CBS/Ch. 2), on of the remaining five contestants is betrayed by his/her strongest ally — or did that contestant do the betraying?

The five remaining contestants — Aubry, Joe, Cydney, Michelle and Tai — will vote one of themselves out tonight. You'd think it won't be Tai, who has a not-so-hidden immunity idol, but … who knows?

Next week, somebody will win the million bucks.

Elsewhere on TV ..

• "The Middle (7 p.m., ABC/Ch. 4): Frankie figures out a way to secretly track Sue and Axl.

• "Heartbeat" (7 p.m., NBC/Ch. 5): An unlikely donor emerges when Alex's father needs a new kidney.

• "Nature" (7 p.m., PBS/Ch. 7): "Nature's Perfect Partnerships" looks at relationships forged by unrelated species.

• "Rosewood" (7 p.m., Fox/Ch. 13): The murder of an undercover ATF agent is connected to a cold case.

• "Arrow" (7 p.m., CW/Ch. 30): Felicity asks her father for help when Team Arrow learns what Damien Darhk's next move iwill be.

• "The Goldbergs" (7:30 p.m., ABC/Ch. 4): Beverly and Lainey team up to destroy something they both despise — Barry's favorite shirt.

• "Criminal Minds: Beyond Borders" (8 and 9 p.m., CBS/Ch. 2): In back-to-back episodes, an American college student working in Johannesburg is killed and his brother disappears; Americans are targeted by killers in Cuba.

• "Modern Family" (8 p.m., ABCCh. 4): Dede's getting remarried, and Manny persuades everyone to take the train to the wedding.

• "Law & Order: SVU" (8 p.m., NBC/Ch. 5): A contestant on a reality-dating show claims she was raped.

• "Nova" (8 p.m., PBS/Ch. 7): A Nazi plan in 1943 to shell London using "superguns" housed in an underground complex in northern France is recalled.

• "Empire" (8 p.m., Fox/Ch. 13): Cookie finally lets Jamal in on the truth about what happened to Freda's father.

• "Supernatural" (8 p.m., CW/Ch. 30): Dean and Sam come up with a plan to rescue Castiel from Amara.

• "Underground" (8 and 9 p.m., WGN America): Everyone must pay for their sins when the day of reckoning arrives.

• "Black-ish" (8:30 p.m., ABC/Ch. 4): Dre has to take care of the kids while Bow and Ruby are quarantined with the flu.

• "Nashville" (9 p.m., ABC/Ch. 4): Juliette has a reunion with her former costar and meets Kesha; Will endures a loss.

• "Chicago P.D." (9 p.m., NBC/Ch. 5): Burgess shoots the person she thinks just shot and wounded Roman — but it turns out she shot an unarmed, 17-year-old honor student.

• "The Americans" (11 p.m., FX): "The Day After" premieres and Elizabeth tries to complete the "Patty" operation.

• "Lopez" (11 p.m., TV Land): George plans a big birthday party for his daughter.

• "The Soul Man" (11:30 p.m., TV Land): Old neighbors crash an event that celebrates Boyce's first campaign commercial.