Aliens in Canadian SF can be used to explore Canadian multiculturalism, the feeling of alienation, diaspora (being without a home), ethnicity, the clash of cultures, and the extents and limits of the human. Aliens are often created as a foil, an opposite, an other to humanity, but many Canadian SF authors (such as Julie Czerneda, and Douglas Smith) complicate this ideology and put the reader in the perspective of the alien, occasionally even alienating the reader from the experience of the ‘human’ by presenting human beings as alien in behaviour as the figure from a different planet.
Aliens call on us to question ourselves, to see ourselves from a new perspective and examine what it means to be human. They challenge us to look at ourselves in a distorted mirror. In the words of Canadian author Judith Merrill “We have met the Alien and it is us” (Afterward, Tesseracts).