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"The Killer Robot Instability"

When Penny's comments about Wolowitz's love life sends him into depression, the boys are about to lose their most important teammate in an upcoming robot fighting competition.

"The Bath Item Gift Hypothesis"

It's Christmas time and Sheldon is annoying everyone with his theories on gift giving etiquette. Meanwhile, Leonard gets jealous when Penny stars dating one of his handsome co-workers.

"The Vartabedian Conundrum"

When Sheldon and Penny convince Leonard that Stephanie has moved in, Sheldon tries to slow the relationship down.

"The White Asparagus Triangulation"

Sheldon tries to secure Leonard's relationship with Stephanie and sets up a scenario where Leonard can prove he's the alpha male.

"The Lizard-Spock Expansion"

Wolowitz thinks he's found his soul mate, Dr. Stephanie Barnett (Sara Rue), until she meets Leonard. Wolowitz lets Stephanie drive the Mars rover, which gets stuck in a ditch.

"The Panty Piñata Polarization"

When Penny's cable goes out, she starts going over the guys' apartment to watch America's Next Top Model. However, after violating some of Sheldon's arbitrary rules, he bands her from coming over.

"The Cooper-Nowitzki Theorem"

After an open house night at the University with grad students, an obsessive student Ramona Nowitzki (Riki Lindhome) likes Sheldon and makes her way into becoming his girlfriend / assistant.

"The Euclid Alternative"

When Leonard needs to work the graveyard timeslot to gain access to the lasers for his experiment, Sheldon loses his ride to the university.

"The Griffin Equivalency"

Raj is included in People's "30 under 30 to watch" list, prompting the rest of the group to be jealous.

"The Barbarian Sublimation"

When Penny locks herself out of the apartment, she comes to hang out with Sheldon in his as he plays Age of Conan. Penny, frustrated by her recent failures in life soon plays and becomes addicted to Conan.