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Passing through Stargate, a young boy (Jeff Gulka) who calls himself Charlie (after O'Neill's dead son) warns of a threat to humanity from the Reetou, a race of invisible aliens. Aware of the dreaded Goa'uld's ability to harvest host bodies, the Reetu have sworn to kill all humans in order to stop the Goa'uld in their tracks. The future of Mankind rests in the hands of the half-human, half-Tok'ra Jacob Carter (Carmen Argenziano), who may be able to render the Reetu visible before it is too late.