Roger pawns off a project on Don, Joan goes on a business trip and Peggy and Pete cannot agree on how to deal with an account.

Charlie is visited by the ghosts of his ex-girlfriends while Alan and Jake are on a road trip.

Charlie gets tired of Alan’s mooching and reaches the breaking point during the brothers’ double date. Jake is left home alone for the first time.

Penny hosts a Hallowe’en party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills.