NBC News anchorman Brian Williams traveled to Russia to go Inside the Mind of Edward Snowden (9 p.m., NBC/Ch. 5).We know that Snowden tells Williams that he's a spy. So ... something tells me he's not going to come out of this with increased credibility.Elsewhere on TV ...NBA playoffs (6:30 p.m., ESPN): Miami Heat at Indiana PacersStanley Cup playoffs (6 p.m., NBCSN): Los Angeles Kings at Chicago BlackhawksGrowing Up Fisher (7 and 7:30 p.m., NBC/Ch. 5): Joyce's sister arrives unexpectedly; The World Wars (7 and 10 p.m., History): In the third and final episode of this series, WWII breaks out.NOVA (8 p.m., PBS/Ch. 7): In "D-Day's Sunken Secrets," scientists search the ocean floor off Normandy for relics of the Allies' WWII invasion.World Music Awards (8 p.m., NBC/Ch. 5): Scheduled performers include Mariah Carey, Miley Cyrus, Jason Derulo, Fall Out Boy and Flo Rida. Motive (9 p.m., ABC/Ch. 4): Angie and Vega investigate a possible suicide in the Season 2 premiere.One Night Only: A Comedy Tribute to Don Rickles (10 p.m., Spike): Robert De Niro, Johnny Depp, David Letterman and Jon Stewart are among those scheduled to appear.