Sheldon has been asked to discuss his research on monopoles on NPR and the guy is ridiculously excited.  He even dresses up for a radio interview being conducted in his office.  Unfortunately as he goes to give it, the always annoying Kripke injects helium into the room, and it makes Sheldon have an embarassingly high pitched voice.  

After being humiliated, Leonard and Raj talk him into getting revenge, but out of killing Kripke (unfortunately).  Sheldon does an elaborate motion-sensenored chemical reaction that creates foam when Kripke enters his office.  Unfortunately, be brings in the President of the school and the board and they all get foamed only to have a prerorded video Sheldon come on a screen in the room to announce he did it.  Oh and in the video he mentions Raj and Leonard.  Will they keep their jobs?

Meanwhile, Wolowitz has his third date with Bernadette (Melissa Rauch), and she tells him she needs to know his intentions if they're going to have sex.  Wolowitz gets scared to commit because he's holding out for a Megan Fox.  During a dream sequence from Katee Sackhoff, he realizes how bad he messed up by not calling Bernadette for a week and heads to the Cheesecake Factory.  He proposes to her and like a sane person, she rejects him.  He then makes a romantic gesture and he wins back his lady.