Which running back was nicknamed "Beast Mode"?

Which player was nicknamed "Prime Time"? Which quarterback was nicknamed "Broadway Joe"? Which quarterback was nicknamed "Joe Cool"? Which receiver was nicknamed "Megatron"? Which running back was nicknamed "The Bus"? Which linebacker was known simply as "L.T." and revolutionized the pass rush with the Giants? Which defensive lineman was nicknamed "The Minister of Defense"? Which Bears defensive tackle was nicknamed "The Refrigerator"?