Home & Family Mark Steines and Debbie Matenopoulos welcome Amy Grant and Jordan Smith to perform in the annual Christmas special. Trans-Siberian Orchestra and Andra Day also perform. 6 p.m. Hallmark
The Big Bang Theory Stephen Hawking (himself) learns Wolowitz (Simon Helberg) once made a remote-operated action figure of him. Jim Parsons, Johnny Galecki, Kaley Cuoco, Kunal Nayyar and Mayim Bialik also star. 8 p.m. CBS
DC's Legends of Tomorrow The Legends find Jonah Hex (Johnathon Schaech) battling Quentin Turnbull (guest star Jeff Fahey) in the Old West....