Related by context. Frequent words. (Click for all words.) 50 alien 47 Sigourney Weaver 47 Earthlings 46 Lex Luthor 46 Hugo Weaving 45 aliens 44 Astro Boy 44 alien invasion 43 Autobots 43 Jennifer Connelly 43 Anakin 43 extraterrestrials 43 Bettany 43 baddie 42 alternate universe 42 Van Helsing 42 Na'vi 42 extraterrestrial 42 Leonard Nimoy 41 Tony Stark 41 Sam Neill 41 titular character 41 Obi Wan 41 intergalactic 41 Cylons 41 Charlton Heston 41 reptilian 40 Jeff Goldblum 40 Galactica 40 sentient 40 Han Solo 40 Jodie Foster 40 Cylon 40 Dakota Fanning 40 werewolf 40 Jon Voight 39 Keanu Reeves 39 creature 39 Ron Perlman 39 spaceship 39 Obi Wan Kenobi 39 Sam Rockwell 39 Spock 39 cyborg 39 supervillain 38 Gregory Peck 38 demonic 38 Chris Hemsworth 38 Liam Neeson 38 sci fi 38 Sylar 38 interstellar 38 Neeson 38 Laurence Fishburne 38 Paul Bettany 38 Silver Surfer 38 Tom Welling 38 Malcolm McDowell 38 Anna Faris 38 Goku 38 undead 38 planet 38 Danny Glover 38 Sean Bean 37 Frodo 37 Lois Lane 37 Donald Sutherland 37 Pierce Brosnan 37 Beckinsale 37 Nicholas Cage 37 Golden Compass 37 malevolent 37 William Hurt 37 supernatural 37 Samus 37 Hellboy 37 outer space 37 Optimus Prime 37 terminator 37 Captain Kirk 37 Samantha Morton 36 Martians 36 WALL E 36 John Cusack 36 starship 36 Dr. Strangelove 36 beings 36 otherworldly 36 Deep Impact 36 earthly 36 Nick Fury 36 Cloverfield 36 Sam Worthington 36 Blade Runner 36 Terminator 36 Alien 36 cosmic 36 droid 36 robot 36 Battlestar 36 Eric Bana