On the sunless moon Io, Marshall William T. O’Niel goes toe-to-toe with the corrupt manager of a mining colony and his gang of roughnecks while investigating a rash of worker suicides.

Top Cast

Sean ConneryMarshal William T. O'Niel

Peter BoyleMark Sheppard

Frances SternhagenDr. Lazarus

James B. SikkingSgt. Montone

Kika MarkhamCarol O'Niel

Clarke PetersSgt. Ballard

Steven BerkoffSagan

John RatzenbergerTarlow