sci-fi metal?

Samael - Solar Soul?
Kovenant - S.E.T.I?
Zeromancer - Clone Your Lover?
Blaze - Silicon Messiah?

dunno, I'm not much for lyrics/themes... shame metal archives doesn't let you search by that parameter like 'genre' n shit.
 
Sci fi metal, do you mean metal bands with sci fi lyrics and themes? If so check out Star One and Threshold. Both bands seem to have some sci fi lyrics and Threshold seem to have some sci find sound effects at times.