'THE AMERICANS': Elizabeth Jennings (played by Keri Russell) faces a whole new set of challenges on her latest mission. (Craig Blankenhorn/FX)

One castaway’s paranoia threatens the entire game, and a grade-school memory challenge looks more like a college-level exam for the physically and mentally drained contestants on “Survivor: Cagayan” (CBS at 8 p.m.).

This week’s “American Idol” (Fox at 8) has the finalists picking songs for one another, a set-up which could be ripe with sabotage.

“HGTV Smart Home 2014” (HGTV at 8) showcases a Tudor-style home in Nashville that’s tricked out with a slew of technological innovations.

FINALE WATCH: The original four-part docu-series “Revealing” (SundanceTV at 9) wraps up with an exploration into how fashion knockoffs make it to the black market in an episode titled “True or Faux.”

The “American Pickers” (History at 9) team heads to a sprawling Connecticut dairy farm and then to a barn in Vermont, where they find ultra-rare skis for a Model T Ford.

FINALE WATCH: Jordan strikes a difficult deal to get a prized 1965 James Bond attache case on “Toy Hunter” (Travel at 9:30).

Both Philip and Elizabeth face new challenges in their missions on “The Americans” (FX at 10), while Stan fights to get access to a government database.

“Nashville” (ABC at 10) repeats an episode in which Rayna and Juliette are at odds to find a way to announce Juliette’s deal with Highway 65.

Megan is Jeff’s new executive assistant on “Flipping Out” (Bravo at 10), but it appears as though things don’t go well because Jeff begs Jenni to come back.

SERIES PREMIERE: “Web of Deceit” (TLC at 10) tells the stories of people getting financially and emotionally taken advantage of online. In the opener, a woman wires more than $60,000 to a nonexistent person.

SERIES PREMIERE: Starring Lorenzo Borghese of “The Bachelor” fame, “Lucky Bastards” (Esquire at 10) follows a group of New York pals who have been friends for decades.

SERIES PREMIERE: The reality series “Unusually Thicke” (TVGN at 10) follows Alan Thicke, sitcom dad and father to pop star Robin Thicke, through his daily motions while getting into peculiar situations with former celebrity friends.

Actor Bradley Cooper stops by “The Tonight Show Starring Jimmy Fallon” (NBC at 11:35), with musical guest Tim McGraw.

Actors Sylvester Stallone and Theo James are on the “Late Show With David Letterman” (CBS at 11:35), with music from Ledisi.

Actors Emma Stone and Jeff Perry come to “Jimmy Kimmel Live” (ABC at 11:35), with a musical performance from Schoolboy Q.

Rachel Lubitz