MASTERS OF SEX: Virginia, Libby and Bill face life-altering choices on the seasn finale. (Michael Desmond Photography/Showtime)

Katherine’s bustling career as a successful New York marketing executive calls for a long trip back home to Louisiana on “Christmas on the Bayou” (Lifetime at 8 p.m.), but instead of relaxing, she’s faced with an old admirer and is torn by her Southern roots. Stars Hilarie Burton, Tyler Hilton and Ed Asner.

Later on the network, “A Snow Globe Christmas” (10) has an overworked TV executive and a very magical snow globe that transports her to a new life with new, impossible problems. Stars Alicia Witt, Donald Faison and Christina Milian.

Actor John Goodman plays host to “SNL” (NBC at 11:30) with Kings of Leon as musical guest.

Sunday talk shows: “Platts Energy Week” (WUSA at 7:30 a.m.) interviews Southern Company’s Tom Fanning; “This Week in Defense News” (WUSA at 8) has Todd Harrison of the Center for Strategic and Budgetary Assessments; “BioCentury This Week” (WUSA at 8:30) features Keckley Health Industry Research and Policy Analysis’s Paul Keckley; “Fox News Sunday” (Fox at 9) hosts Rep. Paul Ryan (R-Wis.); “White House Chronicle” (WETA at 9) has the Wilson Center’s Robert Daly and the Brookings Institution’s Jeffrey Bader.

“State of the Union” (CNN at 9) features Corporate and Investment Banking’s Peter Orszag; “Government Matters” (WJLA at 9:30) hosts Blue State Digital’s Clay Johnson and FedScoop’s Dan Verton; “This Week” (ABC at 10) features Secretary of State John F. Kerry; “Newsmakers” (C-SPAN at 10) talks to Rep. Harold Rogers (R-Ky.); “This Is America & the World” (WETA at 10 and WHUT at 6 p.m.) talks to Kairat Lama Sharif , head of Kazakhstan’s Agency for Religious Affairs ; “Meet the Press” (NBC at 10:30) has Ryan and Sen. Patty Murray (D-Wash.); “Face the Nation” (CBS at 10:30) talks to Sens. John McCain (R-Ariz.) and Dick Durbin (D-Ill.).

FINALE WATCH: On Sunday night, to wrap up the first season of critical darling “Masters of Sex” (Showtime at 10 p.m.), Masters’s sex research is presented to the board, Virginia finds herself having to make several critical, life-changing decisions about her future at the school and Libby wonders how the new baby will affect her relationship with Bill.

RETURNING SHOW: Alton Brown is back at the helm of “Cutthroat Kitchen” (Food Network at 10) for its second season and four new fearless chefs compete in a contest where sabotage reigns supreme.

— Rachel Lubitz