Who Do You Think You Are?

NBC | 7:00 pm

Originally adapted by Lisa Kudrow and Dan Bucatinsky from a hit British series, this exploration of celebrity family trees enjoyed a run on NBC from 2010 to 2012 before making a move to cable for subsequent seasons. Now, however, the program returns to its original network home base in this reboot, which once again will feature genealogists, historians and other experts helping stars untangle their personal roots. Featured stars this season include Billy Porter, Allison Janney, Nick Offerman, Zachary Levi, Bradley Whitford and Zachary Quinto.