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7 p.m. on FOX Lucifer

The true identity of Lt. Pierce (Tom Welling) is revealed, leaving Lucifer (Tom Ellis) trying to sort out his apparent motives in a new episode called “All About Her.” Hoping to win Chloe’s (Lauren German) help with his investigation into that matter, Lucifer bends over backwards to help her solve the murder of a professional surfer.

7 p.m. on PBS Antiques Roadshow

Now in their 22nd season, you might think the producers of PBS’ most-watched ongoing series would be running out of new destinations to visit, but they find one in Pennsylvania in the new episode “Harrisburg (Hour One).”

7 p.m. on CW Supergirl

With Reign (Odelle Annable) continuing to wreak havoc in National City, Supergirl (Melissa Benoist) enlists the help of Saturn Girl (guest star Amy Jackson), as well as two of Supergirl’s former foes, Psi and Livewire (guest stars Yael Grobglass, Brit Morgan). Together, they set off on a mission to Fort Rozz to retrieve a prisoner who claims to hold information on how to stop Reign once and for all.

7 p.m. on TBS, TNT The Alienist

Adapted from Caleb Carr’s bestselling psychological thriller, this new eight-episode series has its official premiere tonight, after a preview on Sunday. The story is set in 1896, as New York during the Gilded Age is rocked by gruesome murders targeting boy prostitutes. Newly appointed police commissioner Teddy Roosevelt (Brian Geraghty) calls upon criminal psychologist Dr. Laszlo Kreisler (Daniel Bruhl, pictured,) to help track this serial killer.

7:30 p.m. on CBS Man With a Plan

And you think you’ve had a lousy workday? Adam (Matt LeBlanc) takes his kids to work with him for the day, but they leave behind an unwanted souvenir for his biggest client: a case of head lice. On the homefront, Andi (Liza Synder) gets the irrational feeling she’s a bad mom when she is the only family member not to be attacked by the critters as she deals with the infestation.