the first time i ever saw this movie be probably in 1992 when this be still on the video shelf and as far a scifi horror go and this be one of the very best there be . i will not go into the story line a you can read that in the plot summary . but i will say this and watch shadowzone and you will find yourself in the realm of parallel universe and unknown creature and demon from the inner mind and human fear . the character be develop pretty well and louise fletcher ( esp ) and david beecroft and james hong be give good performance . i think there be a great deal of atmosphere as well a tension building and in my opinion this be definitely j. s. cardone his best work . see this movie . especially if you be interested in a great scifi horror flick . i be give shadowzone a 9 out of since this be a classic example of turn basic horror element ( in this case the storyline ) into an effective and creepy and moody and atmospheric film . get your hand on this gem and if you can find it .