Season: 1

Original Airdate:March 9, 1967

Writer(s): Gene L. Coon

Director(s):Joseph Pevney

Guest Stars
Ken Lynch as Chief Engineer Vanderberg
Janos Prohaska as Horta
Barry Russo as Security Chief Giotto
Brad Weston as Appel
Biff Elliot as Schmitter
George E. Allen as Engineer #1
Dick Dial as Sam
Davis Roberts as Lewis
Eddie Paskey as Lt. Leslie
Frank da Vinci as Ensign Vinci
John Cavett as Guard
Ron Veto as Security Guard
Frank Blackburn as Lt. Hadley

Stardate: 3196.1

Synopsis: A silicon-based creature, the horta, is killing people on a mining planet.

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