A human disguise (also human guise and sometimes human form)[1] is a concept in fantasy, folklore, mythology, religion, literature, iconography, and science fiction whereby non-human beings — such as gods, angels, monsters, extraterrestrials, or robots — are able to shapeshift or be disguised to seem human.[2][3] Stories have depicted the deception as a means used to blend in with people, and science fiction has used the dichotomy to raise questions about what it means to be human.[4]
Disguises also aid in crossing racial barriers, often represented in science fiction through the use of aliens in space or robots. Sometimes humans attempt to pass as the other ... more often, aliens, and robots attempt to appear human.
Stories of secret identities have roots in ancient mythologies as disguised deities frequently descended to walk among mortals.