Why would a super advanced race of aliens bother with making a slave race? Seems like a lot of trouble to generate a species for the sole purpose of being a worker race.
Are we just robots?
We’re incredibly efficient machines. 2 lbs of organic material and we function for 16 hrs. If we run out of fuel we’ll continue to function for up to a month while we search for a new fuel source. We’re also self-replicating, and self-repairing up to a certain point. If you can ride a bike 10 miles on a bowl of oatmeal, you’re doing a lot better at converting potential energy to momentum than a robot.