Ep 12. The Killer Robot Instability

Sheldon and Leonard find themselves in hot water with their university when their latest scientific invention, a robot designed for military reconnaissance, malfunctions and wreaks havoc throughout the building. As they try to fix the robot and contain the damage, tensions rise between the two roommates as they blame each other for the failure. Meanwhile, Howard and Raj compete against each other on an online video game to win the heart of a comely young gamer. As the gaming competition heats up, both men find themselves struggling to balance their virtual and real-life relationships. And when Penny accidentally gets caught up in the middle of the robot rampage, she turns to Sheldon and Leonard for help - but will they be able to save her before it's too late? With plenty of laughs, hijinks, and a healthy dose of geek culture, "The Killer Robot Instability" is a must-see episode for fans of The Big Bang Theory.