Crew of an undersea mining platform falls prey to mysterious and dangerous parasite. The parasite has the ability to affect people's minds, so survivors can't be certain who is safe and who is infected.

• Concorde-New Horizons
• The Pacific Trust
• Roddy McDowall
• Alex Hyde-White
• Melanie Shatner
• Don Stroud
• Rodger Halston
• Emile B. Levisetti
• Richard Biggs
• Sha-Ri Pendelton