is the 15th episode of the fourth season of the hit CBS sitcom The Big Bang Theory , which originally aired on February 10, 2011. Episode Synopsis
After a night of conversation, Mrs. Latham makes it clear that she will only donate a substantial sum for a new cryostat—essential equipment for Leonard’s research—if he agrees to sleep with her. Key Plot Points [S4E15] The Benefactor Factor
Best known for her role as Lucille Bluth on Arrested Development , Walter delivers a sharp, predatory, and comedic performance as the formidable Mrs. Latham. is the 15th episode of the fourth season