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.

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

Lorelai and Rory plan a road trip to North Carolina to attend the wedding of Mia (KATHY BAKER - "Picket Fences"), a woman who served as their surrogate mother/grandmother for many years. Emily invites herself on the trip in an effort to get away from Richard, who is driving her crazy while he recuperates at home. At the wedding, Emily becomes upset by the close relationship Mia shares with Lorelai and Rory. Lorelai learns that Emily had visited Mia during the years they were estranged to ask for pictures of Lorelai and Rory. And Logan makes a surprise appearance to ask Rory to forgive him for his immature reaction to his business disaster. Meanwhile, Lane and Zack (recurring guest star TODD LOWE) ask Luke to be the godfather of their twins. When Lane goes into labor, Luke helps everyone get to the hospital.

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.