Re: VOY: The Eternal Tide by Kirsten Beyer Review Thread (Spoilers!)
The only time I can remember them actually using the last one after Season 1 was in "Demon", and even then it was a silly contrived plot device.
They ran out of deuterium, somehow.
"Did you know that there is a million bucks hidden in the house next door?"
"But there is no house next door."
"No? Then let's go build one!"