Sheldon and Amy are thrilled when their super-asymmetry theory is proved correct by two physicists from Chicago - until the experts try to exclude Amy from their Nobel Prize nomination. Bernadette experiences a big success at work and plans for Penny to become a part of it - whether she wants to or not

Sheldon is excited to help Howard and Bernadette navigate some bureaucratic paperwork, until he discovers that they are breaking the law, leaving him with a difficult choice between following the rules or staying loyal to his friends. Leonard is disappointed when he is excluded from a scientific project his friends are working on

Penny tries to put a stop to Leonard's plan to be a sperm donor for her ex-boyfriend Zack's wife. Howard, Bernadette, Anu and Raj make the most of the latter's cancelled stag party

When the friends find out that Wil Wheaton is hosting a celebrity game of Dungeons & Dragons at his home, deception and betrayal become the order of the day as they compete to occupy the one open seat at the event. With guest appearance by William Shatner, Kareem Abdul-Jabbar and Kevin Smith

Penny and Bernadette go to San Diego for a pharmaceutical sales convention, leaving Howard in charge of the children. When Sheldon finds a book containing science experiments to carry out with children, the guys and Amy make a day of it, using little Michael and Halley as test subjects

Sheldon and Amy's academic rivals embark on a publicity tour, so the couple try to get the Nobel laureates on their side. Halley's fear of the dark leads to opportunity and conflict for Howard, Bernadette and Stuart

Candid interviews with boy band legends including Boyz II Men, Backstreet Boys and NSYNC reveal the dark side to manufactured superstardom.

A man who calls himself 'The Bishop' abducts six women. As captives begin to die, one woman knows her only chance of survival is to escape.