The science-fiction genre has been huge in entertainment for decades now. We can look back to the ‘60s and ‘70s as the spawning grounds for colossal sci-fi titles, like Doctor Who and Star Trek on TV, and then Star Wars and Alien on the big screen.
All of these franchises remain popular and even ongoing today, and all of them are very heavy on the presence of aliens. With the rise of video gaming, alien-themed games have added to the vast array of outer-space creatures that we now know, with the likes of Halo, XCOM, and Mass Effect being the long-standing favourites.