Saturday’s Highlights

SERIES

Castle: Castle and Beckett (Nathan Fillion, Stana Katic) go around and around over the case of a nanny whose body is found tumbling inside the dryer of a laundry room in the upscale apartment building where she worked. Jayne Brook and George Newbern guest star in this repeat (10 p.m. ABC).

SPECIALS

American Beaver: A custom-designed camera system is used to track an American beaver for a full year to see how her constant need to build changes the terrain and affects the species living in her environment (5 and 8 p.m. National Geographic).

MOVIES

Spellbound: Gregory Peck stars as an amnesiac accused of murder, and Ingrid Bergman plays the brilliant psychoanalyst who falls in love with him as the two flee the authorities while unlocking the mysteries of his tortured memory in this 1945 thriller from director Alfred Hitchcock (3 p.m. TCM).

Lawrence of Arabia: This 1962 epic, from director David Lean and producer Sam Spiegel, relates the saga of World War I British officer T.E. Lawrence (Peter O’Toole), who befriended the Saudi Arabians during their battle with the Turks. Alec Guinness, Anthony Quinn and Omar Sharif also star (5 p.m. TCM).

Aliens: James Cameron threw this sci-fi movie franchise into hyperdrive via a dose of here-come-the-Marines adrenaline. Sigourney Weaver reprises Ripley, who accompanies a highly trained military squad to eradicate the chest-bursting creatures who destroyed her spacecraft in “Alien.” Michael Biehn, Paul Reiser and Bill Paxton also star (6 p.m. Syfy).

SPORTS

College basketball: NIT Tournament, second round: North Carolina at Mississippi State (9 a.m. ESPN). NCAA Tournament second round (10 a.m.; Noon; 2:30 and 5 p.m. CBS).

Women’s college basketball: NCAA Tournament, first round whip-around coverage (9 and 11:30 a.m.; 5 p.m. and 7:30 p.m. ESPN2).

College wrestling: NCAA Championships (4:30 p.m. ESPN).

Hockey: The New York Islanders visit the Kings (7:30 p.m. FSN).