The year before the release of Terror Within 1989 , a similar science fiction horror movie named The Watchers 1988 was released and had a similar looking B Sci-fi Horror make up creature effects. Also both movies had two sequels both except Andrew Stevens appeared in Terror Within 2 1991 prior to the first one , while Marc Singer appeared in Watchers II 1990 while Corey Haim appeared only in the first Watchers 1988.
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