Charlie Sheen plays Zane Zaminski, a radio astronomer who discovers evidence of extraterrestrial life.
Lindsay Crouse portrays Ilana Green, a government official who works closely with Zane on understanding the alien signals.
Richard Schiff takes on the role of Calvin, a colleague of Zane who assists in the investigation.
Ron Silver plays Phil Gordian, a government operative with a vested interest in the extraterrestrial findings.
Teri Polo portrays Char, Zane's love interest who supports him through his discoveries.
Phyllis Applegate plays Mrs. Roosevelt, a character who interacts with Zane in the story.
Tony T. Johnson appears as Kiki, a character involved in the plot surrounding the alien investigation.
Alan Coates plays Terraformer, contributing to the movie's exploration of alien life.
Leon Rippy portrays DOD #1, part of the defense department team involved in the investigation.
Buddy Joe Hooker plays DOD #2, another member of the defense department team.
Javier Morga appears as a Co-worker of Zane, providing support in his scientific endeavors.
David Villalpando plays Cabbie, a character who aids Zane in his journey.
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