The Arrival

An alien and a robot land on Earth after World War II and tell mankind to be peaceful or face destruction.

After a fatal test shuts down their project, a disgraced team of scientists enters the criminal underworld to rebuild a forbidden space-bending engine that could rescue humanity or annihilate it entirely.

A small-town doctor learns that the population of his community is being replaced by emotionless alien duplicates.

When an alien race and factions within Starfleet attempt to take over a planet that has "regenerative" properties, it falls upon Captain Picard and the crew of the Enterprise to defend the planet's people as well as the very ideals upon which the Federation itself was founded.