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Alien seeds hitch a ride to earth in a space shuttle. They will be unstoppable when they reach the Threshold amount.
Ultimate Limit or Le Seuil in Quebec (Threshold) is an American-Canadian film directed by Chuck Bowman and aired on April 19, 2003 on Sci Fi Channel. It is an adaptation of the 1958 film La Fusée de l'apervante (It! The Terror from Beyond Space).
This article uses material from the Wikipedia article "Ultimate_Limit", which is released under the Creative Commons Attribution-Share-Alike License 3.0.