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Best: The merge
Episode: "For Immediate Release" (606)
It was the episode that changed everything in Season 6: Don Draper and Ted Chaough decide to align their separate firms in order to persuade Chevy they have what it takes to handle a top secret new car. And so SCDP merged with CGC, Peggy and Don became co-workers again and the long hunt for a new name began (before the partners finally settled on Sterling, Cooper & Partners in episode 610, "A Tale of Two Cities").