Which Chicago Bears legend was known as "The Galloping Ghost"?

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"? Which quarterback was nicknamed "The Gunslinger"? Which tight end is known by the nickname "Gronk"? Which Steelers quarterback was nicknamed "Big Ben"? Which running back, nicknamed "Kansas Comet," starred for the Bears in the 1960s?