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
"The Big Bang Theory" The Benefactor Factor (TV Episode 2011) - Plot [S4E15] The Benefactor Factor
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. is the 15th episode of the fourth season