Human-alien encounters Interplanetary voyages 19 Enemies 18 Space flight 17 Space ships 15 Enterprise (Imaginary space vehicle) 6 Exploration 6 more ... Exploration of outer space 6 Science and civilization 6 Sightings and encounters 6 Unidentified flying objects 6 Monsters 5 Quests (Expeditions) 5 Space warfare 5 Extraterrestres 4 Extraterrestrial beings 4 Life on other planets 4 Feature films 3 Pandora (Imaginary place) 3 Street youth 3 Viajes interplanetarios 3 Video recordings for the hearing impaired 3 Yakuza 3 Adventure and adventurers 2 Expediciones de exploración 2 Families 2 Friendship 2 Manned space flight 2 Monstruos 2 Resurrection 2 less ...