The Green Slime (1968)
[examining a charred corpse from which smoke is still rising]
Lisa Benson: He's dead.
Dr. Hans Halvorsen: But it proves out: this creature lives on energy, and discharges energy! That would explain its ability to electrocute Michaels! One cell, one microscopic speck left on a space suit, and it would absorb all the energy it could find.
Commander Jack Rankin: Wait a minute -- are you telling me that this thing "reproduced" itself inside the decontamination chamber? And, as we stepped up the current, it just... it just GREW?
Dr. Hans Halvorsen: Precisely! And they could be reproducing on any part of this station, where even a drop of this substance can reach ANY form of energy!
Commander Vince Elliott: Jack... the power room! If he's right, those things are going to be all over the place!
Lisa Benson: Jack, do you realize that this is the first time that anything living has been found in space? Do you know how terribly important that is?