* The Big Bang Theory (9:31/8:31c CBS)
Katee Sackhoff of Battlestar Galactica and National Public Radio's Ira Flatow have cameos in tonight's episode, in which Sheldon is humiliated on NPR and then promises vengeance on his nemesis Kripke. Sackhoff appears as - and, no, this isn't a joke - Wolowitz's new love interest.
* Surviving the Holidays with Lewis Black (8/7c History)
Apparently, Lewis Black was never visited by three ghosts in the night. (Even they would be afraid of him.) But the irascible comedian visits viewers and offers his unique take on the holidays, and it's open season on all traditions and customs. Among the topics are giving gifts; Kwanzaa; Hanukkah; Saint Nicholas; drinking on New Year's Eve; and Thanksgiving Day football. Black also visits a turkey farm and plays a department-store Santa.
When Jon & Kate Plus 8 premiered in 2007, it was an endearing look at life in a large family. Sadly, over the last year it morphed into a heartbreaking view of life in a broken family, yielded countless tabloid covers and demonstrated how fame can truly change people. (We're talking to you, Jon.) Tonight's installment of what was once TLC's highest-rated series, which some will argue should have ended months - or even years - ago, will be its last. Whether you're on Team Jon or Team Kate, we can all only hope for the best for the eight little ones caught in the middle.
* Find My Family (9:30/8:30c ABC)
Reunited and it feels so good. It's all in the family in this new relationship-reality series that reunites families with long-lost loved ones. In the inaugural episode tonight, hosts Tim Green and Lisa Joyner join forces with the series search team in a journey to Wisconsin, where they help parents Scott and Sandy Steinpas find their daughter, whom they gave up for adoption 29 years ago. Each episode features poignant family backstories and concludes with heart-tugging follow-up segments.
Seth Green and Matthew Senreich have been busy lately. They recently wrapped up the fourth season of Robot Chicken, and have also been working on Titan Maximum, a new stop-motion comedy launched in September on Adult Swim. But the guys still had time to deliver a third installment of their popular Star Wars spoof. The one-hour special is a can't-miss for fans.