The Doomsday Defense was the nickname given to the famous defense of the Dallas Cowboys American football team during the dynasty years of the late 1960s - 1970s. This defense was the backbone of the Cowboys' dynasty, which won two Super Bowls (VI, XII) and played in three more (V, X and XIII). The first defensive player to be named Most Valuable Player of the Super Bowl was linebacker Chuck Howley (V). Later linemen Harvey Martin and Randy White became the first (and only) teammates (co-MVPs) to win the award (XII).