Paul hosts a party at his apartment and introduces someone special to his Sterling Cooper colleagues. Peggy visits her family for dinner. Despite a conflict of interest, the Sterling Cooper agency aggressively pursues an airline account and Duck attempts to appeal to the client using an unorthodox approach.

Trouble arises on the set of a commercial; Harry tries to gather support for a controversial sponsorship; Betty and Don try to appease a client with a friendly dinner.

The writers make an attempt to stave off late-night boredom during a mandatory overtime session. Roger throws a party as Joan and Greg host their own party. Sally has a run-in with Grandpa.

The firm celebrates as they hit a milestone. Peggy and Paul compete to secure the same account.

Peggy's taste in men proves questionable. Pete has to make a big decision about his career and a candidate makes a big impression on Don.