why is saying that alien technology provides infinite free energy unbelievable . you are assuming that these races evolved technologically along the same lines as humans. there is a very interesting documentary done by this physicist and his theory is that advanced races may have technology so vastly different from ours that what we think of as advanced science could be a infants toy to them. free infinite energy is not outside the realm of possibility.
Infinite energy may not even be that far from reality currently. Take the Super Colliders and the photons/anti-matter or whatever those whacky scientist are working on. Anyways I am no physicists, but it seems that even in reality infinite energy is not that implausible.
http://en.wikipedia.org/wiki/Super_Large_Hadron_Colliderhttp://en.wikipedia.org/wiki/Particle_acceleratorThe movie The Saint and Chain Reaction, both came out in the 90's i think, and both were about limitless energy.
I don't want to debate that the energy isn't infinite as there is a finite amount of hydrogen on earth, blah blah blah
I'm just saying, it's not too ridiculous to make a movie about it.
I think in most Sci-Fi the aliens have some source of energy that is practical infinite anyways.
I doubt all the Star Wars ship were Diesels.
What about all those alien energy weapons you see in most sci-fi, they have to get energy from something.
What powers a Transformer.
I think these questions all defeat the purpose of Science Fiction media and Author Craft,
it's for entertainment.
If it's explained well and plausible, let it ride. (once again, I am not arguing what is plausible, just using this term loosely here)
Moreover, nothing is perfect, personally I could find some way to pick apart any fiction.