Specimen: Unknown

Summary

Scientists on a space station discover an unusual and dangerous plant.

Guest stars

• Stephen McNally as Col. MacWilliams
• Richard Jaeckel as Capt. Mike Doweling
• Gail Kobe as Janet Doweling
• John Kellogg as Major Nathan Jennings
• Peter Baldwin as Lt. Gordon Halper
• Russell Johnson as Major Benedict
• Arthur Batanides as Lt. Ken Galvin
• Dabney Coleman as Lt. Rupert Lawrence Howard (uncredited)
• Bob Johnson as Project Adonis Intercom Announcer (voice) (uncredited)