Alien seeds hitch a ride to earth in a space shuttle crew and begin to grow. When their numbers reach the Threshold amount they will be an unstoppable swarm.
Nicholas Lea
as Dr. Jerome 'Geronimo' Horne
Jamie Luner
as Dr. Savannah Bailey
Steve Bacic
as Frank Hansen
David Lipper
as Matt Bailey
Teryl Rothery
as Shelley Hansen
Karl Pruner
as Quidd
Anthony Sherwood
as Dr. Thaddeus Owens
Marie Ward
as Sheila
Stephen J. Cannell
as Pacheco Laval
Colin Glazer
as Clay Collins
Joseph Marrese
as Kerry Hansen
Evan Caravela
as Terry Hansen
