You are viewing a list of 3 The Big Bang Theory episodes featuring "Formulation" in their title.
  • The Vengeance Formulation

    Season 3, Episode 9 - The Vengeance Formulation
    Aired November 23, 2009

    When Barry Kripke pulls a prank on Sheldon which embarrasses him on national radio, Sheldon vows revenge. Meanwhile, Howard tries to keep his new relationship with Bernadette going.

  • The Irish Pub Formulation

    Season 4, Episode 6 - The Irish Pub Formulation
    Aired October 28, 2010

    Raj's sister Priya is in town and soon rekindles a past secret relationship with Leonard. Leonard keeps his new affair a secret from the rest of the gang, but Sheldon finds out about the relationship and helps Leonard by developing an elaborate lie.

  • The Cohabitation Formulation

    Season 4, Episode 16 - The Cohabitation Formulation
    Aired February 17, 2011

    Raj's sister, Priya, is in town again and rekindles her relationship with Leonard, prompting Penny to reconsider her feelings for him. When Bernadette asks Howard to move in with her, he is forced to choose between his girlfriend and his mother.