The Psychic Vortex

"The Psychic Vortex" is the 12th episode of The Big Bang Theory's third season. It aired on January 11th 2010.

Summary
Sheldon and Raj attend a university mixer, with Sheldon as Raj's wingman. Sheldon only goes because Raj bribed him with a Green Lantern lantern, which Sheldon brings with him to the mixer. They meet Abby (Danica McKellar), who takes a liking to Raj, and her friend Martha (Jen Drohan), who tries to connect with Sheldon. They end up playing Rock Band at Sheldon's place. For a second date, Raj bribes Sheldon with his pair of Hulk hands, signed by Stan Lee. During the date, when Sheldon says he's heading off to bed, Martha follows and asks if she can sleep in the same room. Sheldon obliges, and states he'll just sleep in Leonard's room, nullifying any means for the two to have sex together. Meanwhile, Leonard and Penny go on a double date with Howard and Bernadette, and Leonard is upset to discover that Penny believes in psychics. Later, Howard shows Leonard that he will have to accept that sometimes his partner will impose her beliefs to him if he wants to be in relationships. Title reference: Penny's belief in psychics.

Trivia

 * This episode marks the last appearance of Sheldon's Red Dell XPS m1710 laptop, and Leonard's Dell XPS m1710 laptop, before they are stolen in the next episode "The Bozeman Reaction" and replaced by an Alienware M17 Nebula Red Laptop (Sheldon) and a Dell XPS Adamo Laptop (Leonard)
 * Danica McKellar who portrays Abby had a role in Babylon 5, one of Leonard's favorite series.
 * Penny says, "Well, the last big thing I did was this production of Diary of Anne Frank above a bowling alley." She first mentioned this play in The Terminator Decoupling.