Not the proverbial `green men' but something like green caterpillars are to be seen in this invasion-from-space type of science-fiction tale. But essentially the aliens are the type, familiar from Invasion of the Body Snatchers and sundry other films, which take over human bodies - a reliable device which also serves to cut down the necessity for too much elaborate and expensive special effects work. Melinda Fee co-stars as Tom Mason's assistant who renders help in his investigation, and also featured is Caroline McWilliams of Benson fame.

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