Watch 711-s05-e015-tbbt -

: 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.

While your query mentions "S05," Season 5, Episode 15 is actually titled . In that episode: Watch 711-S05-E015-TBBT

: The primary streaming home for all 12 seasons of TBBT. : Penny initially believes the character is based