Do yourself a favour and read Roger Ebert's review which opens as follows:

This movie has to be seen to be believed. On the other hand, maybe that's too high a price to pay. "Highlander 2: The Quickening" is the most hilariously incomprehensible movie I've seen in many a long day - a movie almost awesome in its badness. Wherever science fiction fans gather, in decades and generations to come, this film will be remembered in hushed tones as one of the immortal low points of the genre.