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

Best known for her role as Lucille Bluth on Arrested Development , Walter delivers a sharp, predatory, and comedic performance as the formidable Mrs. Latham.

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

For more details on the cast and crew, you can visit the IMDb episode page .

The plot centers on a moral dilemma faced by Leonard Hofstadter. The University is hosting a fundraising gala to court wealthy donors. Leonard meets , a wealthy, older widow and potential benefactor played by guest star Jessica Walter.

"The Big Bang Theory" The Benefactor Factor (TV Episode 2011) - Plot

The duo spends much of the gala trying to impress wealthy women, with Raj using his "silent charm" (since he still cannot speak to women without alcohol at this point in the series) and Howard using his usual misguided pick-up lines.