Arthur Hill plays Dr. Jeremy Stone, the lead scientist tasked with containing and studying the deadly extraterrestrial microorganism.
David Wayne portrays Dr. Charles Dutton, a key member of the team of scientists working to prevent a potential global outbreak.
James Olson takes on the role of Dr. Mark Hall, a scientist involved in the investigation of the extraterrestrial threat.
Kate Reid stars as Dr. Ruth Leavitt, a microbiologist who plays a crucial role in analyzing the alien microorganism.
Paula Kelly plays Karen Anson, a nurse who aids the team of scientists in their high-stakes mission.
George Mitchell portrays Jackson, a member of the team working to understand and contain the alien threat.
Ramon Bieri takes on the role of Major Manchek, a military officer involved in overseeing the response to the extraterrestrial crisis.
Peter Hobbs stars as General Sparks, a high-ranking military official overseeing the government's actions in response to the alien threat.
Kermit Murdock portrays Dr. Robertson, a scientist involved in the containment and study of the deadly microorganism.
Richard O'Brien plays Grimes, a member of the team assisting in the investigation and containment of the extraterrestrial threat.
Eric Christmas appears as the Senator from Vermont, a political figure involved in the decision-making processes surrounding the alien crisis.
Mark Jenkins portrays Lt. Shawn, a member of the Piedmont team sent to investigate the initial outbreak of the deadly microorganism.
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