#5: Johnny Unitas, Baltimore Colts, San Diego Chargers

Johnny Unitas was the first NFL quarterback to break into the national consciousness after the legendary 1958 NFL championship game, but he was more than that. A three-time MVP and five-time First Team All-Pro, Unitas won three NFL championships in an era where defenses weren’t as handicapped by rules as they are now. He was also the first QB to be prolific in the clutch, with his 34 fourth-quarter comebacks and 38 game-winning drives. The next signal callers built off the foundation that Johnny U laid, starting with another Colt that revolutionized the position.

Next: #4