Human-alien encounters Extraterrestrial beings 56 Interplanetary voyages 48 Life on other planets 36 Time travel 28 Exploration 23 Video recordings for the hearing impaired 14 more ... Space warfare 12 Feature films 11 Government investigators 11 Informers 11 Interstellar travel 11 Science fiction films 11 Seres extraterrestres 11 Space flight 10 Space ships 10 Space stations 10 Unidentified flying objects 10 Enemies 8 Friendship 8 Men in black (UFO phenomenon) 7 Odo (Fictitious character) 7 Science and civilization 7 Sisko, Benjamin (Fictitious character) 7 Women ship captains 7 Closed caption video recordings 6 Rencontres avec les extraterrestres 6 Sightings and encounters 6 Alien abduction 5 Encuentros humanos con extraterrestres 5 less ...