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"DC's Legends of Tomorrow" (7 p.m., CW/Ch. 30) gives us the conclusion of the four-part crossover that has taken us through "Supergirl," "The Flash" and "Arrow" — and, at long last, there's actual fighting between the heroes and the aliens.
We learn why Earth is being invaded by the Dominators, and it's kind of a surprise. And one particularly annoying character from one of the shows actually stops being so annoying … at long last.
Also tonight, "A Charlie Brown Christmas" — arguably TV's best Christmas special — returns (7 p.m., ABC/Ch. 4).
Elsewhere on TV ...
• NFL (6:25 p.m., NBC/Ch. 5 and NFL Network): Dallas Cowboys at Minnesota Vikings
• "The Big Bang Theory" (7 p.m., CBS/Ch. 2): Sheldon and Leonard fight over how to divvy up their shared possessions; Howard and Raj fight over who can be the most helpful to Bernadette in the final weeks of her pregnancy.
• "Rosewood" (7 p.m., Fox/Ch. 13): A case takes Rosewood and Villa to Cuba.
• Men's college basketball (7 p.m., P12N): Montana State at Utah
• NBA (7 p.m., ROOT): Miami Heat at Utah Jazz
• "The Great Indoors" (7:30 p.m., CBS/Ch. 2): Jack is clueless about how to help Eddie through the pain of his divorce, so Brooke steps up to be Eddie's interim best friend.
• "Mom" (8 p.m., CBS/Ch. 2): Christy learns that her 12-year-old son has been using drugs and alcohol.
• "The Great American Baking Show" (8 p.m., ABC/Ch. 4): In the Season 2 premiere, the contestants bake a variety of cakes, cookies and biscotti.
• "Pitch" (8 p.m., Fox/Ch. 13): Rumor is that Mike has waived the no-trade clause in his contract.
• "Supernatural" (8 p.m., CW/Ch. 30): Lucifer realizes that as rock star Vince Vincente, he can get his fans to do whatever he wants.
• "Life In Pieces" (8:30 p.m., CBS/Ch. 2): John encourages Samantha to skip her ballet class and take up boxing; Jen tries to quietly get a second opinion when Tim tells her she needs tonsil surgery.
• "Pure Genius" (9 p.m., CBS/Ch. 2): The surgeons must perfect a remote surgery when an astronaut on the International Space Station needs an emergency procedure.