Bad episode, bad movie. Don't really care if they're connected or not.
I can't agree. I found "The Nth Degree" one of the more enjoyable TNG episodes. The only plausibility thing I struggled with was Barclay "transferring" most of his consciousness into the ship's computer. Perhaps a different kind of being could do that, but not the human mind no matter how much you increased intelligence. It's simply not possible given the way the human brain works.
The "Cytherians" was another one of those enormous technology infusions for Starfleet that went nowhere. Given all they learned about how space could be warped and take the Enterprise across vast distances in practically no time, you'd think that this would be quickly adopted. But no, it was forgotten never to appear again.