'MASTERS OF SEX' Dr. Langham (L) becomes more and more suspicious of the relationship between Dr. Masters and Johnson. (Michael Desmond/SHOWTIME)

FINALE WATCH: The yet-to-be-officially-canceled “Crossbones” (NBC at 8 p.m.) ditches its regular Friday-night slot for Saturday so it can reel off its last two episodes in peace. And with a season closer titled “Blackbeard,” expect him to get the rowdy exit he deserves.

RETURNING SHOW: Season 4 of “Hell on Wheels” (AMC at 9) opens with Cullen waiting for the arrival of his baby and Durant still dealing with the fallout from a railroad accident.

Sunday talk shows: “Platts Energy Week” (WUSA at 8 a.m.) interviews former governor Bill Ritter (D-Colo.); “BioCentury This Week” (WUSA at 8:30) features Rep. Tim Murphy (R-Pa.); “Fox News Sunday” (Fox at 9) hosts Sen. Marco Rubio (R-Fla.); “White House Chronicle” (WETA at 9) has the National Foundation for Cancer Research’s Franklin Salisbury Jr.; “State of the Union” (CNN at 9) features Gov. Rick Perry (R-Tex.); “Government Matters” (WJLA at 9:30) hosts Sen. Charles E. Grassley (R-Iowa).

“Newsmakers” (C-SPAN at 10) talks to Sen. David Vitter (R-La.); “Sunday Morning Futures With Maria Bartiromo” (Fox News Channel at 10) hosts Sen. John McCain (R-Ariz.); “This Is America & the World” (WETA at 10 and WHUT at 6 p.m.) talks to U.S. ambassador to Benin Michael Raynor; “Face the Nation” (CBS at 10:30) talks to Pierre Krahenbuhl, commissioner general of the U.N. Relief and Works Agency for Palestinian Refugees.

And then, quite suddenly, it was 1996. On Sunday night, “Wrestlemania 30: The World Television Premiere” (NBC at 7 p.m.) celebrates 30 years of men in tight-fitting pants smashing into one another for sport with appearances by Hulk Hogan, “Stone Cold” Steve Austin and Dwayne “the Rock” Johnson.

On premium cable, “True Blood” (HBO at 9) has Eric, Pam and Mr. Gus closing in on Sarah in Dallas as Adilyn and Wade struggle to find a temporary refuge.

Later on the network, Nora leaves for a conference in New York on “The Leftovers” (HBO at 10), where she ends up snooping around for her imposter.

Dr. Austin Langham wants answers from Virginia after seeing her with Bill at their hotel on “Masters of Sex” (Showtime at 10).

FINALE WATCH: “Halt and Catch Fire” (AMC at 10) wraps up its first season (keep in mind that it hasn’t been cleared for a second season yet) with Gordon and Joe transporting the Giant and Cameron taking charge of her future.

Rachel Lubitz