The greys can't breed with us. The greys DNA is too manipulated to be able to breed with us. The Vulcans are a natural race like ours they didn't go
through DNA manipulations like the greys.
LOL no Spock is not a robot, he's half vulcan and half human. His mother is human and his father is the vulcan ambasidor. He was raised on vulcan and
trained to live as one.
IDK about vulcans being greys tho, but the OP raises an interesting point.
When I first saw the title to the OP for this thread i was like "some lucky person got to see the new Star trek movie!" I'm a long time trekker
and i'm ashamed to admit I havn't seen it yet but am dieing to do so and probably will the day after tomarow when ever hubby is off work.
According to some trek lore, vulcans can breed with humans but it does take some tinkering of the dna or sperm and egg for it to work. I think that
question was brought up to the doctor of the ship on the series "Enterprise" ( not next generation ) eh wiki might have some more info on it.
it does raise an interesting concept. that often "good" movies or tv shows about alien races use their real counterpart personalitys or social
structures. Other than the asgard(sp?) on stargate... no other shows have taken that no emotion route in a social structure.
I personaly believe a plant based lifeform would be unable to evolve to a high intelligence. The greys are most likely humanoid robots used by other
races to visit and study the universe.