In The Big Bang Theory episode "The Dead Hooker Juxtaposition" (S02E19), the arrival of an attractive, manipulative new neighbor named Alicia creates a "Shadow Archetype" for Penny, challenging her social standing within the group. The episode culminates in a physical confrontation between the two women after the guys prioritize Alicia's demands over Penny's friendship. Read a detailed recap at TV Tropes . The Big Bang Theory Season 2 Episode 19 Recap - TV Fanatic
