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Sheldon has a song stuck in his head; despite their awkward date, Amy asks Dave over for dinner; Koothrappali and Wolowitz are obsessed with a fan of their band.

After dating for more than five years, Amy and Sheldon spend the night together for the first time; Leonard, Wolowitz, and Koothrappali must decide what to do with an extra movie ticket.

Leonard agrees to meet with a psychiatrist (Jane Kaczmarek) on Penny's behalf; Sheldon and Koothrappali work together on an astronomical discovery; Wolowitz and Bernadette struggle with their feelings when Stuart moves out.

After dealing with Sheldon while he was sick, Leonard, Penny and the gang attempt to treat themselves to a Sheldon-free weekend.

Sheldon's excitement about his Meemaw's visit fades when she butts heads with Amy; Raj questions his relationship with Emily after meeting someone new.

Pam accidentally brings lice into the office but lets Meredith take the blame; Jim spends a great day in Philadelphia with a potential business associate; Nellie, Phyllis and Kevin interfere with Darryl's love life.

Everyone abuses the office's new espresso machine; Dwight takes Clark on a sales call; Darryl goes for an interview at Jim's company; Pam surprises Jim with a visit.

Dwight tries to stop Darryl from leaving; Jim misses Cece's first recital because of work, upsetting Pam; Nellie exposes Erin and Pete.