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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 to let her stay at his apartment (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 more 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 recently broke up with Leonard. Later that day, at the Caltech cafeteria, Dr. Plimpton meets Raj and wants to bed him, too. That night, Howard and Leonard come to Ra...


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