In the night, a vision suddenly appeared in the sky, and the mysterious light from space disappeared in the depths of the sea. In an old people's home, Joe (Hume Cronin Hume Cronyn) and a group of old people enjoy life as much as possible in the shadow of life exhaustion, and they are interested in swimming in the swimming pool next door. Meanwhile, Jack (Steve Guttenberg Steve Guttenberg), who runs a cruise ship rental, receives a group of guests who claim to rent the boat to study the big oysters in the sea and put the salvaged oysters in the pool next to the old people's home. Old people often swim in the swimming pool, but after there are a few more "dome" here, the old people get a steady stream of energy from the water and coruscate their youthful vitality. Jack, who was on board, was surprised to find that his guests were not researchers at all, but extraterrestrials looking for "oyster"-shaped compatriots.
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