How many seasons you need to catch up on: Season 6 just wrapped and, boy, was it a doozy!

Why it's important to start from the beginning: Don Draper is a complicated man, and throughout each season he sprinkles details about his past, like breadcrumbs. In order to form a nearly complete picture of the broken man he's become, you need to start from Season 1.

Plus, he's had so many affairs at this point that it would be difficult to keep up if you don't have some background.