Now that his two latest shows are over, Nickelodeon uber-producer Dan Schneider brings two of the characters on board a new series, “Sam & Cat” (Nickelodeon at 8). Sam (Jennette McCurdy from “iCarly”) and Cat (Ariana Grande from “Victorious”) are two polar opposites who become unlikely best friends and roommates and start a babysitting service.

New drama “Sinbad” (Syfy at 9) follows “flawed hero” Sinbad, who flees from his hometown to rid himself of a curse.

Sunday talk-shows: “Platts Energy Week” (WUSA at 7:30 a.m.) interviews Candian ambassador Gary Doer, Bureau of Ocean Energy Management’s Walter Cruickshank and Coalition for Fair Transmission Policy’s Sue Sheridan; “This Week in Defense News” (WUSA at 8) has Rand Corp.’s Michael Shurkin, Brookings Institution’s Michael E. O’Hanlon, Decision Sciences’ Stan D. Sloane and Washington Institute for Near East Policy’s Andrew Tabler; “BioCentury This Week” (WUSA at 8:30) features PATIENTSLIKEME’s Ben Heywood; “Fox News Sunday” (Fox at 9) hosts Sens. Rand Paul (R-Ky.) and Ronald H. Johnson (R-Wis.) and Gen. Michael Hayden; “White House Chronicle” (WETA at 9) has Milo Public Relations’ Peter Loge and PostTV’s Pamela Kirkland; “State of the Union” (CNN at 9) features Sens. John McCain (R-Ariz.) and Mark Udall (D-Colo.).

“The Chris Matthews Show” (NBC at 10) hosts Time’s Joe Klein, Huffington Post’s Howard Fineman, NBC’s Kelly O’Donnell and MSNBC’s S.E. Cupp; “This Week” (ABC at 10) features Sens. Dianne Feinstein (D-Calif.) and Mark Udall (D-Colo.) and Rep. Mike Rogers (R-Mich.) and the Guardian’s Glenn Greenwald; “Newsmakers” (C-SPAN at 10) talks to Sen. Debbie Stabenow (D-Mich.); “This Is America & the World” (WETA at 10 and WHUT at 6 p.m.) talks to the National Education Association’s Dennis Van Roekel; “Face the Nation” (CBS at 10:30) talks to Sens. Kirsten Gillibrand (D-N.Y.) and Kelly Ayotte (R-N.H.) and Rep. Jackie Speier (D-Calif.); “Bloomberg Government’s Capitol Gains” (WUSA at 11:30) has Navy Secretary Ray Mabus, Bloomberg’s Mark Drajem, Tony Costello and Danielle Ivory.

Sunday night, Neil Patrick Harris hosts the Tony Awards (CBS at 8) from Radio City Music Hall in New York City. Musicals with the most nominations include “Kinky Boots” and “Matilda the Musical.”

Alien invasion drama “Falling Skies” (TNT at 9) returns for Season 3, more than six months after the group has settled in South Carolina, and Tom (Noah Wyle) is officially elected to office.

— Emily Yahr