Luck is a six-part series that looks at one of the biggest what-if’s in NFL history - the career of Andrew Luck. How does one of the greatest quarterback prospect ever end up walking away from the game before he’s 30? Host Zak Keefer talks to those closest to Andrew Luck - former teammates, coaches, executives - to detail what made Luck exceptional, the pain he endured, and why ultimately he chose to retire when he did.