Courier Tom Jessup loses track of a briefcase containing something vital: spores. These organisms, properly nourished, will grow into aliens able to tolerate Earth's high oxygen content. Through mischance, Jessup loses track of the briefcase, which changes hands several times. Finally, some kids wind up with it, and meanwhile inside it the spores continue to grow, and outside it, Jessup is increasingly desperate. Written by
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The invaders are seen for perhaps the first and last time as spores growing into "infants" that appear to be slimy, brown-and-green-tinged blobs. They have neck-less heads and each is seen to be forming a pair of stubby arms. Of course, this is only what their young look like. See more
Some dialog, including the opening narration, refers to local law enforcement as the sheriff's department and to Sergeant Goldhaver as a sheriff's deputy, but other dialog, and all of the signs at the station as well as the patches on Goldhaver and Lieutenant Mattson's sleeves say "Police". See more
Shortly before dawn, a spaceship landed near Phillipsburg, Colorado, bringing to Earth a strange and ominous cargo: two dozen spores. After exposure to the Earth's atmosphere, each will develop and grow into a perfectly formed alien. On the success of this experiment rests the possibility of future shipments numbering hundreds, perhaps thousands, of alien Invaders and possibility the future of the human race.