Clutch's south seas island vacation is cut short when the natives tell him their rare black pearls are being stolen.
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https://www.youtube.com/watch?v=T6xtWQ3KRDE
The evil Dr.Rootes provoke an incident at Space City Power Plant in order that an alien space ship bring a plant seed which invades the planet. Steve, Venus and Matt must accompany Dr.Rootes to Planet Hedra in order to get an antidote to this sudden vegetal invasion.
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https://www.youtube.com/watch?v=vtJt8XNc_lY