Many aliens had visited Earth before Zephram Cochrane met Vulcans in Star Trek: First Contact... 1 / 7
But in fact, Star Trek: Enterprise revealed Vulcans had been on Earth since the 1950s... 2 / 7
With T'Pol revealing a survey mission crashed in 1957. 3 / 7
T'Pol presented this as just a story, but she clearly considered it true. 4 / 7
The Vulcans did exert a subtle influence on human science and technological development. 5 / 7
Of course, other Vulcans - notably Spock - visited Earth in the past by time travel... 6 / 7
And still more aliens have been on the planet in the past too. 7 / 7