[s4e15] The Benefactor Factor -

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.

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. [S4E15] The Benefactor Factor

"The Big Bang Theory" The Benefactor Factor (TV Episode 2011) - Plot The duo spends much of the gala trying

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 Leonard meets , a wealthy, older widow and

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

Despite his hesitation, Leonard eventually goes through with it. The next morning, Mrs. Latham reveals she had already written the check before they went to bed, making Leonard realize he technically did it for "nothing"—though she hints she might still have more money to donate. Supporting Subplots

When Leonard seeks advice from Penny, she finds the situation hilarious and encourages him to do it, teasing him about being a "gigolo" for science.