Saturday’s TV highlights

SERIES

Saturday Night Live: Katy Perry hosts with musical guest Robyn (11:29 p.m. NBC).

SPECIALS

Republican debate: GOP presidential candidates discuss issues in Des Moines; moderated by Diane Sawyer and George Stephanopoulos (6 p.m. ABC).

Rudolph the Red-Nosed Reindeer: The reindeer with the incandescent nose guides Santa’s sleigh through a bad storm on Christmas Eve in this holiday classic based on the song by Johnny Marks (8 p.m. CBS).

The American Giving Awards: Bob Costas hosts this new special, which honors the United States’ most deserving charities. Bob Costas hosts (8 p.m. NBC).

Extreme Christmas Trees: This new special focuses on over-the-top Christmas trees (9 p.m. TLC).

MOVIES

Annie Claus Is Coming to Town: When Santa’s daughter (Maria Thayer) takes a vacation in Los Angeles — her first time away from the North Pole — she finds friends, adventure and a chance at love that could lead to an elf’s takeover of Santa’s operation. Vivica A. Fox and Vicki Lawrence also star in this new romantic comedy (8 and 10 p.m. Hallmark).

Snowmageddon: Michael Hogan, David Cubitt and Magda Apanowicz star in this new tale of a snow globe that makes bad things happen when it is shaken (9 p.m. Syfy).

Appropriate Adult: A volunteer (Emily Watson) listens to the confessions of serial killer (Dominic West) in this new drama (10 p.m. Sundance).

SPORTS

College basketball: Duke vs. Washington (9 a.m. CBS); Cincinnati at Xavier (9:30 a.m. ESPN2); Ohio State at Kansas (12:15 p.m. ESPN); Kentucky at Indiana (2:15 p.m. ESPN); Pennsylvania vs. UCLA (4 p.m. FSN); New Mexico at USC (4 p.m. FSN2).

College football: Montana State at Sam Houston State (9 a.m. ESPN); Army vs. Navy (11:30 a.m. CBS).

Hockey: The Ducks visit the Nashville Predators (5 p.m. KDOC); the Dallas Stars visit the Kings (7:30 p.m. FSN).