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: Leonard writes a murder mystery novel featuring a character named "Ilsa," who is a thinly veiled, unflattering version of someone in his life.

: Sheldon appears on a special episode of "Professor Proton" (Wil Wheaton's show) and struggles with the fact that he isn't the center of attention. Why the confusion with S05E15? Watch 711-S05-E015-TBBT

Sheldon's "Roommate Agreement" is suspended after Leonard gets tired of Sheldon’s demanding nature. : Leonard writes a murder mystery novel featuring

Sheldon attempts to live without Leonard's help, leading to a series of comedic failures. Where to Watch " who is a thinly veiled

: Penny initially believes the character is based on her, leading to tension. However, it is eventually revealed that the cold and domineering character is actually based on Leonard's mother, Beverly Hofstadter.