- Chaos ensues when a nymphomaniac physicist visiting Sheldon hooks up with Leonard.
- Sheldon's brilliant pen pal friend, renowned quantum cosmologist Dr. Elizabeth Plimpton, is being wooed by Cal Tech. Sheldon invites her to stay with him and Leonard while in Southern California. Sheldon feels protective of her because he feels she is in the same genius class as himself. Leonard is in awe of their temporary roommate. Dr. Plimpton, however, makes it obvious to Leonard that she is interested in him more than just as a fellow scientist. Leonard has a difficult time keeping his intimate encounter with Dr. Plimptom a secret. She doesn't seem to mind as she sets her sights a little more broadly than just Leonard.—Huggo
- When Raj tries to eat with the guys in the cafeteria, his sneezing gets him banished by the Germophobic Sheldon to another table. Sheldon has to talk to Leonard giving him the official 24-hour notice (according to the roommate agreement) that a non-related female will spend two days at their apartment. She is a human female, as no pets are allowed, other than seeing-eye dogs and cybernetic-engineered helper monkeys. She is Dr. Elizabeth Plimpton (Judy Greer), the world-famous cosmological physicist from Princeton University. Sheldon and she have been corresponding for years about gravitational wave signatures of Inflatons in the early universe. Leonard is a huge fan of hers. She will sleep in Sheldon's room though not sharing the room.
Walking up the stairs, Sheldon questions Penny on his choice of maxi-pads in his bag, whether the wing design is just a marketing ploy. Naturally, Penny needs it explained, and Sheldon tells her about everything he bought for his lady friend: scented soaps, pantyhose, Midol, calcium chew tablets, and the yogurt that is good for regulating the female bowels. Sheldon requests that Penny not waste her time with a lot of female banter, such as hair styles, shoe styles, mudpacks, or Brad Pitt and Angelina Jolie.
Dr. Plimpton shows up at the door. Sheldon insists Leonard play it cool, since years from now, Sheldon's biographer might ask him questions about this event. Dr. Plimpton remembered to write their building number on her left hand, because her right hand contained the coordinates of a new neutron star, and she didn't want to visit there since she would be crushed by hyper gravity. She says hello twice like Sheldon and Leonard did when they first greeted Penny. She appears to be a bit Ditzy. Sheldon greets her, and Leonard is rather nervous to meet Dr. Plimpton, shaking her hand three times and saying "hi-lo." (A combination of hi and hello.) Sheldon apologizes because he is only an experimental physicist. Dr. Plimpton admits that some of her friends are experimental physicists, though not her best friends.
Sheldon shows her to his bedroom and gives her the tour, rules and regulations. Gloves are available to wear if she wants to peruse his comic book collection. She also has an emergency 8-day ration kit is at the ready in case of disaster. Dr. Plimpton does ask about the relationship status of Leonard. Sheldon explains his former relationship with Penny, which was over as inexplicably as it started. They wish each other good night or good luck in case they have an apocalypse.
Later, she decides to visit Leonard's room because she can't sleep. He's reading her book and is on Chapter 6. She tells him a little secret that she wrote it completely naked. A confused Leonard finds that it doesn't read that way. She shows him, recites some of it and drops her robe as she quotes from her book. The two go on to have sex.
Everybody wakes up in the morning with Sheldon doing morning vocal tests and Leonard and Elizabeth coming in together. They had more than a pleasant night while giggling together. She is having coffee when Penny stops by to request a ride to work because her car is out of gas. She is introduced first to Elizabeth. Elizabeth says she was really enjoying her stay and then looks over at Leonard and giggles. Penny picks up on her body language. Sheldon suggests that she use the bathroom because she doesn't want to follow Leonard. Leonard goes to get dressed, but Penny stops him telling him that they just broke up. She doesn't care if he wants to sleep with Sheldon's doctor buddy. Sheldon is offended that Penny would suggest it. Penny isn't suggesting it. She maintains that it already happened. Sheldon is shocked at what Leonard did, who claims that it wasn't his fault. Sheldon then feels that that implies that he accidentally tripped and fell into her lady parts. Penny is not happy about this turn of events and decides to take the bus, just in case Leonard slips on a banana peel and gets her pregnant. Sheldon is shocked by the betrayal of him and doesn't want Leonard playing with his friend.
At the cafeteria, Sheldon and Elizabeth stop by the table after Howard and Raj can't figure out Leonard's clues as to what he did the prior night. She wants a coffee, but not black. This time, she wants it hot, brown, and sweet while making eyes Raj.
Later Howard shows up at Raj's apartment for Halo Night and finds Elizabeth at his apartment. Elizabeth wants Howard to stay for some role playing games though not the Dungeons and Dragons type. She runs into the bedroom to get ready. Howard is shocked and tells Raj that he broke up with Bernadette weeks ago. Leonard shows up and Elizabeth is excited about that. He wants to know what is going on and Howard welcomes them to the Penthouse Forum. Elizabeth is down to her bra and Raj shoos everybody out to make a dramatic entrance. Then he locks Howard and Leonard out and has her to himself.
Later, walking up the The stairs, Penny asks about Dr. S**t Bunny. She doesn't think he needs to know, but Leonard has to explain why he did it. She let him.
Title reference: Dr. Elizabeth Plimpton visits and "stimulates" Leonard and Raj.
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