Interplanetary voyages 5 Space ships 5 Human-alien encounters 4 Enemies 3 Enterprise (Imaginary space vehicle) 3 Space flight 3 Exploration 2 more ... Exploration of outer space 2 Friendship 2 Science and civilization 2 Space warfare 2 Video recordings for the hearing impaired 2 Closed caption video recordings 1 Drama 1 Manned space flight 1 Resurrection 1 Spock (Fictional character), 1 Viajes interplanetarios 1 less ...