The sixth season of the American sitcom The Big Bang Theory aired on CBS from September 27, 2012, to May 16, 2013. During the season, Kevin Sussman became a part of the main cast as Stuart Bloom. Howard’s mother, furious to learn he plans to leave her for Bernadette to call him at the ISS. To pacify his mother, who wants him 5 senses valentine’s gift for him stay, and Bernadette, who does not, he lies to both.
Whilst sorting out Bernadette’s wedding gifts, Penny confesses being unsure of her feelings towards Leonard, and is worried she might break up with him again. Amy tells Sheldon, who cannot keep the secret but holds back from telling Leonard. Title reference: Penny contemplating whether or not to break up with Leonard given her uncertainty about her feelings in their relationship. Sheldon has his childhood scientific notebooks sent from home, hoping to discover Nobel Prize material in them. Title reference: Sheldon, observing the recent success of the Higgs Boson particle, wants to unearth a discovery he may have made during his childhood that could earn him a Nobel Prize.
After they lose badly to Penny and Amy at Pictionary and Penny declares she can beat them at anything, Sheldon and Leonard challenge the women to a series of games. The girls proceed to easily defeat the boys each time due to Amy’s intelligence, Penny’s athleticism, and Leonard and Sheldon’s inability to work together. Stuart and Raj organize a Halloween costume party at the comic book store. Amy and Bernadette will go with their partners, but Penny dislikes parties at the store.