I won't go into all the science (as if I could), but suffice it to say that in order to send an alien life form back to a nebula, Voyager must plunge everything into darkness. The Borg kids come out of regeneration and Neelix has been given the task of looking out for them. They are incredibly smart, so his task is quite hard. When they immediately become bored, Neelix tells them he will confide in them the story of what happened to Voyager before they came on board. He launches into wild tale of a gaseous life form taking over the ship and pushing the crew to their very limits. We are aware that this may or may not be a story. We ourselves may have been left in the dark. The story is exciting and shows what a gift our imaginations are. Neelix is so annoying and those kids are hard to take at times, but this worked really well.
Review of The Haunting of Deck Twelve
