|Doctor Who-The Seeds Of Death|
When the TARDIS arrives in the 21'st century it finds itself confronted with a society whose sole interest in interstellar travel is confined to a teleportation between Earth and it's moon via a device known as T-Mat. They find themselves in a private museum run by the designer of advanced rocketry systems who soon finds himself again needed as T-Mat no longer functions. Turns out a Martian race known as ice warriors (as seen previously in one of Troughton's "missing" serials),who are intimidating T Mat technicians into helping them with their mission: to invade the Earth by using oxygen depleting seed pods to destroy the population. After a journey in an ion powered rocket to handle the situation on the moon,it's a race against time as almost everyone who deals with the ice warriors are intimidated by them. In the end...well it appears the solution is far less intimidating then the ice warriors approach to their invasion.
Although this was likely conceived as an alien invasion story,it does make a point that's very important in our real 21'st century as it was in this imagined one. The humans operating the T-Mat have lost interest in interstellar travel,due primarily to the wonder and economic feasibility of teleportation. And it's only that economic factor that motivates the T-Mat team,along with the doctors prodding,that encourages them to take the advice of the mildly cynical museum curator to embrace his advanced rocket designs. Basically it's a backhanded tale of the neglect of advancement in the space program. The story also points to some of the doctors controversial morality too. While they are literally cold,hostile and very uncaring aliens the ice warriors are,in the stories conclusion,condemned to die en mass "just as the human race would've",as the doctor himself pointed out. Awkward for a member of a civilized species to embrace the eye for an eye philosophy in a negotiation . In the end though it's a story of all parties having to make difficult choices for survival.