Mad Men’s Pete Campbell is one of TV’s most compelling jerks right now: He’s horrible and mean and petty and jealous and violent, but he’s also kind of a loser. A villain, sure. But a super villain? Not at all. In addition to being mega-punchable, Pete’s also losing his hair. (Vincent Kartheiser himself is not: The show shaves in Pete’s hairline.) So far, season six has made quite a show of Pete’s increasing scalpiness, so let’s look back through Pete’s entire hair journey.