Episode 21 – The Plimpton Stimulation (321)
Dr. Elizabeth Plimpton (Judy Greer), a cosmological physicist from Princeton University, comes to Cal Tech for a job interview. Sheldon arranges her trip, and offers her to stay in his bed (with Sheldon sleeping on the sofa), rather than a hotel which he perceives as less hospitable. Leonard tries to impress her by talking to her about her work, but she’s interested in having sex with Leonard, which he very much welcomes. The next morning, Sheldon is completely oblivious to what happened overnight, but Penny immediately detects what happened based on Leonard’s and Elizabeth’s body language, and becomes jealous, because she broke up with Leonard not too long ago. Later that day, at the Cal Tech cafeteria, Dr. Plimpton meets Raj and wants to bed him, too. That night, Howard and Leonard come to Raj’s apartment for Halo night and find Elizabeth there, so she suggests sex with all three guys, but Raj manages to lock the other two out of the apartment. At the end of the show, Leonard and Penny discuss whether or not he needs to explain to Penny what happened. Although Penny keeps insisting that he doesn’t need to explain anything, Leonard explains that he had sex with Dr. Plimpton because “she let [him]“.
Directed by Mark Cendrowski.
Written by Steven Molaro, Jim Reynolds & Maria Ferrari based on a story by Chuck Lorre, Bill Prady & Lee Aronsohn.
Originally aired on May 10, 2010.
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