Prime time's favourite nerds are off to San Francisco by train to attend a science convention. Who should board the train but the Terminator herself, Summer Glau. All attempts to hit on her are dismal failures; we're talking nerds here. Sheldon has to enlist the help of Penny over the phone to retrieve his paper for George Smoot, giving her access to his personal possessions. Certain to have embarrassing repercussions.

Features Johnny Galecki / Leonard Hofstadter, Jim Parsons / Sheldon Cooper, Simon Helberg / Howard Wolowitz, Kunal Nayyar / Rajesh Koothrappali, Kaley Cuoco / Penny, Summer Glau / Herself, George Smoot / Himself.