The Big Bang Theory

The Vengeance Formulation

Season 3, Ep 9, Aired 11/23/09
Rate Episode
454 votes
  • Episode Description
  • Barry Kripke pranks Sheldon during his spot on NPR, leaving him with a taste for vengeance. Wolowitz, pressured by Bernadette to define their relationship, gets advice from a fantasy version of Katee Sackhoff.

  • Cast & Crew
  • Johnny Galecki

    Leonard Hofstadter

  • Jim Parsons

    Sheldon Cooper

  • Kaley Cuoco


  • Simon Helberg

    Howard Wolowitz

  • Kunal Nayyar

    Rajesh Koothrappali

  • Photos (1)
  • Fan Reviews (6)
  • Bernadette

    By AriSky, Nov 29, 2013

  • 309

    By Canogaparkcindy, Jan 18, 2011

  • Weak.

    By thefanof, Nov 24, 2009

  • an average, but awesome episode :)

    By frances65406, Nov 26, 2009

  • Sheldon is going to be on NPR to discuss his current theory and then is humiliated by a colleague who he is rivals with. Howard and Bernadette go on their third date and based on what that means Bernadette wants to know where their relationship is going.

    By jyarter, Nov 24, 2009

  • Trivia & Quotes
  • Quotes (7)

    • Sheldon: Biologically speaking, Howard is perfectly justified in seeking out the optimum mate for the propagation of his genetic line. Wolowitz: Thank you, Sheldon. Sheldon: And whether that propagation is in the interest of humanity is, of course, an entirely different question.

    • Leonard: You'd have a better shot with the three-breasted Martian hooker from Total Recall. Howard: Okay, now you're just being unrealistic. Anyway, that movie was, like, 20 years ago. Imagine how saggy those things would be.

    • Sheldon: (about his appearance on NPR) My mother is very excited. She's convening her Bible study group to listen in and then pray for my soul.

    • Sheldon: All right. These are the talking points for my NPR interview tomorrow. I need to make sure that they're simple enough for the less educated in the audience to understand. Howard, look this over and tell me what's unclear to you. Howard: Excuse me, I have a master's degree in engineering from the Massachusetts Institute of Technology. It required the completion of 144 units of grad work and an original thesis. Sheldon: Yes. Look this over and tell me what's unclear to you.

    • (entering Sheldon and Leonard's apartment) Howard: Greetings, homies, homette. Penny: Why are you back from your date so early? Howard: In romance, as in show business, always leave them wanting more. Penny: What exactly does that mean? Leonard: He struck out.

    Show More Quotes

    Notes (4)

    • This episode's end titles has Chuck Lorre's Vanity Card #269.

    • Katee Sackhoff, who turned down the role that went to Summer Glau for "The Terminator Decoupling", tagged along when friend and Battlestar Galactica co-star Tricia Helfer filmed a guest spot on Chuck Lorre's other show, Two and a Half Men. Chuck approached Katee with the concept of her appearing as Howard's fantasy, which she accepted.

    • The Italian episode title is "La formula della vendetta", the French title is "La Formule de la vengeance", the German title is "Die Racheformel", and the Spanish and Mexican title is "La f√≥rmula de la venganza", all exact translations.

    • International Airdates: Latin America: January 12, 2010 on Warner Channel; Australia: March 1, 2010 on Channel 9; United Kingdom: April 22, 2010 on E4; Finland: November 22, 2010 on Sub; Turkey: November 29, 2010 on CNBC-e; Czech Republic: December 15, 2010 on Prima COOL; Slovakia: October 27, 2011 on Markiza

    Trivia (1)

    • The foam-forming chemical reaction that Sheldon uses to revenge Kripke is a famous experiment known as "Elephant toothpaste". It can be performed premixing concentratedhydrogen peroxideand a liquid detergent (Sheldonuses dish soap), and then mixing the above with a catalyst (Sheldon uses saturatedsodium iodide solution) that causes rapid decomposition of hydrogen peroxide. The decomposition produces large amount of oxygen and heat; foams are formed due to the liquid detergent and the released oxygen, while the heat causes prominent expansion of the foams.

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