Superman, e.g. (4)
(Other definitions for hero that I've seen before include "One much admired for courage" , "priestess of Aphrodite" , "Courageous man" , "chap we revere" , "Star" .)
(Other definitions for alien that I've seen before include "Outlandish" , "Someone from outer space?" , "Unfamiliar; foreign" , "extraneous" , "Martian, say" .)