When Wolowitz seduces Penny's friend and takes over her apartment, Penny sleeps on Leonard and Sheldon's couch. With Wolowitz preoccupied, the guys discover they are without a fourth member of their group and in desperation, they ask Penny to join their Halo team.
Guest Cast
James Hong
as Chen
Carol Ann Susi
voices Mrs. Wolowitz
Cast Appearances
Kaley Cuoco
as Penny
Episode Discussion
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