TV highlights: Lancelot warns Mary Margaret about King Arthurs motives on Once Upon a Time

All times Eastern.

Comedian Gabriel Iglesias hosts "Mega Fluffy Weekend" (Fuse at 1:30 p.m.), a 12-hour marathon featuring "The Fluffy Movie," episodes of "Fluffy Breaks Even" and stand-up specials from Rick Gutierrez and Gina Brillon.

The Doctor and Clara are taken captive by Vikings on "Doctor Who" (BBC America at 9).

Walter commemorates the 33rd anniversary of the end of the Falklands War with a huge party on "Blunt Talk" (Starz at 9).

A group of college students accidentally unlock a portal to another dimension in the horror movie "They Found Hell" (Syfy at 9).

"Behind the Screams" (Reelz at 9) examines the real events that inspired "The Exorcist" and other films.

Directed by Chris Rock, "Amy Schumer: Live From the Apollo Theater" (HBO at 10) features the comedian's jokes on dating in your 20s, sex and gender.

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Sunday talk shows: "Capital Download" (WUSA at 8:30 a.m.) talks to Democratic political strategist, Tad Devine; "Fox News Sunday" (Fox at 9) hosts Republican presidential candidate Donald Trump; "White House Chronicle" (WETA at 9) has the Providence Journal's Edward Achorn; "State of the Union" (CNN at 9) features former secretary of state Hillary Rodham Clinton; "Government Matters" (WJLA at 9) hosts Jay Finch, head of digital economy at 18F Consulting; "Sunday Morning Futures with Maria Bartiromo" (Fox News Channel at 10) hosts Rep. Susan Brooks (R-Ind.), member of the House Select Committee on Benghazi; "This Is America & the World" (WETA at 10 and WHUT at 7:30 p.m.) examines America's opioid epidemic and "Face the Nation" (CBS at 10:30) talks to Rep. Trey Gowdy (R-S.C.), chairman of the House Select Committee on Benghazi.

SERIES PREMIERE: Artists from Ireland and Britain compete in "Portrait Artist of the Year" (Ovation at noon).

Lancelot warns Mary Margaret about King Arthur's motives, Emma continues to fight against the darkness, and Guinevere tries to help Arthur in a Camelot flashback on "Once Upon a Time" (ABC at 8).

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SERIES PREMIERE: Oprah Winfrey presents "Belief" (OWN at 8), a seven-night documentary about faith.

Alison struggles to pay her bills, Pat's well-received speech has unforeseen consequences, and Claire plans a date with Spencer on "Masterpiece: Home Fires" (PBS at 8).

The Belchers go to a haunted house in an attempt to finally scare Louise on "Bob's Burgers" (Fox at 9).

Tom Selleck stars in "Jesse Stone: Lost in Paradise" (Hallmark at 9), a made-for-TV movie based on Robert B. Parker's bestselling novels.

Batman and Superman's "magical friendship" is explored in a "Robot Chicken" (Cartoon Network at midnight) special.

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