Margo Cathleen Harshman is an American actress known for her role as Tawny Dean on Even Stevens, on The Big Bang Theory as Sheldon Cooper's assistant, Alex Jensen, and as Delilah McGee, Timothy McGee's paraplegic wife on NCIS.
40 years after the events of the bookverse Wizard of Oz, Petra is a private detective in the Emerald City whose most recent case about a missing man leads to something bigger than she expected.
