Morgan had previously written and directed "Jose Chung's Doomsday Defense" earlier in the season.

Later, Frank begins reading one of Chung's books, entitled Doomsday Defense.

Lilly made the adjustment becoming the main man in Dallas's vaunted "Doomsday Defense".

The Cowboys' "Doomsday Defense" finished the season as the top ranked defense in the league against the run by only allowing 107.6 yards per game.

Chung appeared and was killed in the Millennium episode "Jose Chung's Doomsday Defense".

In 1963 he was traded to the Dallas Cowboys for a future draft choice, where he would play defensive end for the original "Doomsday Defense".

The original "Doomsday Defense" can generally be identified as the Cowboys' defenses from 1966 to 1975.

Nicknamed the "Doomsday Defense", they allowed just 1 touchdown in their last 6 games prior to the Super Bowl.

This version of the "Doomsday Defense" had tremendous speed and depth.

Together they helped to form the Cowboys' original "Doomsday Defense", that dominated the NFL for the next 20 years.