Killer Siblings (7 p.m., Oxygen) - This new true crime series explores the psychologies and pasts of cold-blooded siblings who murder.
No Time Like Christmas (8 p.m., Lifetime) - This makes new Lifetime Christmas movies three nights in a row! In this one, a woman and her first love plan a Christmas Eve show in hopes of saving the local theater.
Shark Tank (9 p.m., ABC) - The show checks back in with Justin Miller and Tom Simon of the Raleigh company Zookies Cookies. Zookies Cookies, a healthy dog treat company, made a deal with DryBar founder Alli Webb when they appeared on the show back in February.
Silicon Valley (10 p.m., HBO) - This tech comedy begins its sixth and final season with Richard discovering his promise that Pied Piper won’t collect user data is under threat.
Mrs. Fletcher (10:30 p.m., HBO) - Kathryn Hahn has the title role in this seven-episode limited series based on the best-selling novel of Tom Perrotta. The series chronicles the personal and sexual journeys of an empty-nest mother and her college freshman son, Brendon (Jackson White).
Some programming descriptions are provided by networks.