1) “Elementary,” 10 p.m., CBS. Jonny Lee Miller (shown here) has become the perpetual Sherlock Holmes. Others try. Approximately, Jeremy Britt was Sherlock 43 times; Benedict Cumberbatch, 15; Basil Rathbone, 14; Christopher Lee, 3; Robert Downey Jr., 2. Add them up, throw in lots of others, and you still don’t match this: It’s the 150h episode with Miller as a modern Sherlock, mostly in New York. Tonight, s sculptor has been killed, sparking fears that a serial killer is back.
2) “The Outpost,” 9 p.m., CW. One of the many flaws in the first season was the presence of a handsome knight to sometimes rescue Talon. But he was apparently killed in last week’s season-opener. She refuses to accept his death – hey, this is a fantasy genre – but for now she’s on her own. Tonight – following an “iZombie” in which Liv takes the personality of a drag queen – Liv faces her new rival.
3) “Alien” (1979) and “Aliens” (1986), 6 and 8:30 p.m. ET, BBC America. Here’s a rarity – a sequel, from a diffferent director, that stands on its own as a great film. Ridley Scott made the original; James Cameron triumphed with the sequel. Sigourney Weaver stars in both … and “Alien 3” (1992), at 11:30.
4) “Love, Actually” (2003), 6:41 p.m., Starz. Richard Curtis as become one of our favorite writers and – as creator of the “Red Nose Day” charity – human beings. Some of his scripts – the “Mr. Bean” and “Blackadder” ones — are just silly, but others add quiet bits of humanity. That’s true of “Notting Hill” and “Four Weddings and a Funeral” and the current, delightful “Yesterday.” And it’s true of this gentle gem, one of the few Curtis also directed; it deftly juggles lots of unrelated, Christmastime stories.
5) “Reef Break,” 10 p.m., ABC. Cat (Poppy Montgomery) managed to leave her criminal life behind and work for the governor of this tropical island. But now a man from her past is also helping the governor, making her life dangerous.