They entered Super Bowl IV as 13-point underdogs. But the 1969 Kansas City Chiefs' decisive victory over the Minnesota Vikings put to rest any questions as to whether the fledgling American Football League could compete against the established NFL. It also validated the careers of five future Hall of Fame players and their flamboyant head coach Hank Stram. To become world champions, Kansas City had to overcome more than its share of adversity. Quarterback Len Dawson missed nearly half the season with a knee injury, then was forced to deal with family tragedy and a shocking news story.