On Saturday night, docu-series “Welcome to Sweetie Pie’s” (OWN at 9 p.m.) chronicles the adventures of St. Louis restaurant owner Robbie Montgomery, who once worked as a backup singer for Ike and Tina Turner.

Sunday talk shows: “Platts Energy Week” (WUSA at 8 a.m.) interviews Bank of America’s Jonathan Plowe, Rapidan Group’s Robert McNally and Rice University’s Amy Jaffe; “BioCentury This Week” (WUSA at 8:30) features Amicus Therapeutics’ John Crowley, WMD Center’s Lynne Kidder and retired US Air Force Col. Randall Larsen; “Ideas in Action with Jim Glassman” (MPT at 8:30, 9:30 on WHUT) has author Daniel Yergin; “Fox News Sunday” (Fox at 9) hosts Rep. Eric Cantor (R-Va.) and Sen. Dianne Feinstein (D-Calif.); “Politics Program With Mark Plotkin” (NewsChannel 8 at 9) features D.C. mayor Vincent Gray; “White House Chronicle” (WETA at 9) has transportation consultant Bill Gouse; State of the Union” (CNN at 9) features former House speaker Newt Gingrich; “The Chris Matthews Show” (NBC at 10) hosts Time’s Joe Klein, National Journal’s Major Garrett, BBC’s Katty Kay and The Post’s Nia-Malika Henderson.

“This Week” (ABC at 10) features President Obama campaign adviser David Axelrod, The Post’s Ruth Marcus, strategist Mary Matalin and ABC’s George Will and Jonathan Karl; “Meet the Press” (NBC at 10:30) has Republican presidential candidate Herman Cain, former Gov. Tim Pawlenty (R-Minn.), Gov. Bobby Jindal (R-La.), BBC’s Katty Kay and NBC’s Chuck Todd; “Face the Nation” (CBS at 10:30) talks to Reps. Darrell Issa (R-Calif.) and Elijah Cummings (D-Md.), and CBS’s Sharyl Attkisson; “energyNOW!” (WJLA at 11) talks to the Manhattan’s Institute’s Robert Bryce and author Amanda Little; “Newsmakers” (C-SPAN at 12:10 p.m.) talks to Rep. Pete Sessions (R-Tex.); “This Week in Defense News” (WUSA at 1:30) has U.S. Army chief of staff Gen. Ray Odierno and Army Reserve deputy chief Maj. Gen. Keith Thurgood; “This Is America With Dennis Wholey” (WHUT at 6 p.m.) visits Singapore and talks to Trade Minister Lim Hng Kiang, Citibank’s Michael Zink and Marina Bay Sands’s George Tanasijevich.

On Sunday morning, the Martin Luther King Jr. Memorial dedication ceremony — rescheduled after Hurricane Irene interrupted plans six weeks ago — will take place with the program starting at 9 a.m., and dedication at 11 a.m. Multiple networks are airing the coverage, including CNN, Fox News Channel, WUSA, NewsChannel 8, MyNetworkTV, BET, Centric, TV One, MSNBC and C-SPAN.

After being pushed back thanks to baseball playoff rain delays, “The X Factor” (Fox at 8 p.m.) airs the episode that was supposed to air Thursday, as the contestants audition at the homes of the judges.

“The Walking Dead” (AMC at 9) kicks off the second season with more zombies than ever, as Rick runs into a bigger threat as soon as everyone leaves Atlanta. And after the repeat of the show, new series “Talking Dead” (AMC at midnight) debuts, as Chris Hardwick hosts a discussion show about all things zombies.

— Emily Yahr