Human-alien encounters Extraterrestrial beings 38 Interplanetary voyages 32 Time travel 22 Life on other planets 17 Government investigators 11 Informers 11 more ... Seres extraterrestres 11 Space warfare 8 Friendship 7 Exploration 6 Space ships 6 Alien abduction 5 Closed caption video recordings 5 Enemies 5 Feature films 5 Parapsychology 5 Space and time 5 Space flight 5 Unidentified flying objects 5 Bounty hunters 4 Exploration of outer space 4 Men in black (UFO phenomenon) 4 Monsters 4 Rencontres avec les extraterrestres 4 Video recordings for the hearing impaired 4 Doppelgängers 3 Encuentros humanos con extraterrestres 3 Enterprise (Imaginary space vehicle) 3 Fathers and sons 3 less ...