David Trice

While Sheldon and Koothrappali attend a university mixer, Leonard is upset to discover that Penny believes in psychics. Danica McKellar (The Wonder Years) guest stars as the object of Raj’s attraction.

When the girls' trip to Vegas falls through, the guys invite them to play Dungeons & Dragons – causing Sheldon and Amy's relationship to take an unexpected turn. Meanwhile, Raj and Lucy go on a very awkward date.

Leslie asks Ann to help her convince Chris and Ben to give the parks department more money; Ron and Andy coach basketball; April makes an announcement.

When an 8-year-old is found dead on the Appalachian Trail, the team searches the forests for a man targeting children.

Malcolm convinces Dewey to do poorly on an IQ test, but Dewey does so poorly that he ends up in a class for the emotionally disturbed; Hal and Craig become obsessed with a dance video-arcade game.

Randall adjusts to the foster system. Kate and Toby take the next step in their relationship. Kevin visits Sophie in New York. Jack and Rebecca finalize Randall's adoption.