(There is a knock on the door.) (They leave). Christie and Howard's Mother together: Shut up Howard. Credit Sequence
Scene: Penny, Sheldon, Raj and Leonard stand in the apartment doorway. Howard: In the shower. Howard: No. Howard: So, Halo night, huh? Oh, Penny, Penny, Penny. Penny hears the door close, looks worried, then moves her head to the other end of the couch.) Penny: Hey guys. Penny: I slept all day? Penny: Uh, what time is it? Penny: Well, she was engaged to my cousin while she was sleeping with my brother, so she's kind of family. Penny: Well, there's this girl I know from back in Nebraska, Christie, well anyway she called me up and she's like "Hey, how's California," and I'm like "Awesome" 'cos, you know, it's not Nebraska, and the next thing I know she's invited herself out here to stay with me. Raj: That works. Romantic music plays from Penny's apartment door. Sheldon: No, I'm going to ask him to choose between s*x and Halo 3. Sheldon: Well then, it's all settled, Christie will stay with Howard, Penny can go back to her apartment, and I'll watch the last 24 minutes of Doctor Who, although at this point it's more like Doctor Why Bother. Sheldon: Yes, but you didn't portray her as completely irrational. Sheldon: You go dancing every Wednesday. We're falling apart.
Plan: A: Penny's promiscuous acquaintance Christy; Q: Who is Penny's promiscuous acquaintance? A: Penny's brother; Q: Who did Christy sleep with? A: her cousin; Q: Who was Christy engaged to? A: Penny's apartment; Q: Where does Christy sleep with Howard? A: a Halo 3 player and displays natural talent; Q: What does Penny become after Howard? A: Sheldon's disbelief; Q: What is Sheldon's reaction to Penny's Halo skills? A: Leonard and Sheldon's couch; Q: Where does Penny sleep? A: his mother; Q: Who does Howard live with? A: Distraught; Q: How does Penny feel about the odd number in the group? A: Sheldon invites Penny; Q: Who does Sheldon invite to play Halo? A: their group; Q: What do the guys believe is falling apart? A: three; Q: How many attractive dancing friends does Penny have? Summary: Penny's promiscuous acquaintance Christy from Omaha, Nebraska, "kind of family" since she slept with Penny's brother whilst engaged to her cousin, arrives to visit Penny indefinitely, and immediately beds Howard in Penny's apartment which the pair take over. Penny replaces Howard as a Halo 3 player and displays natural talent, to Sheldon's disbelief. To avoid the noisy "lovers", Penny sleeps on Leonard and Sheldon's couch that night. Next day, Howard invites Christy to move in with him (and his mother), taking up all his time. Distraught at the odd number in the group, Sheldon invites Penny to play Halo again, but she prefers to go dancing. The guys believe their group is falling apart and go to speak to Howard. There they hear Howard's mother arguing loudly with Christy, causing her to leave. Howard, single again, goes to play Halo with the guys, and the group is restored, completely ignoring Penny and her three attractive dancing friends who briefly appear at the door.