Stargate SG-1

Season 9 Episode 10

The Fourth Horseman (1)

Full Episode: The Fourth Horseman (1)

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Full Episode Summary

After an SGC officer returns to Earth after unknowingly being infected with the Ancient Plague, the virus quickly spreads throughout the United States. Not wanting the Ori to gain control of the Milky Way Galaxy, Orlin yet again descends to help Carter find a cure.
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Themes

alien technology, Time Travel, battle for earth, Futuristic, epic adventure