I was thinking about this a little more. I don't think the molecule vibrations would create fire, but just change phase (solid, liquid, gas, plasma). Plasma is very hot so it could be used to create fire. @Moontanman, thanks, I guess; I suppose it's a good thing... Anyway, others of the aliens I mentioned can control light, electricity, sound, water, lava, acid (not the same as you know; just a fictional lime-green, corrosive substance), and metal. If you think about it the most logical power is sound. To control sound waves, you just have to make different pitched sound waves that could control the originals (can cancel the waves out) or just alter the volume controls on your tv or radio or computer speakers.