Season: 2

Original Airdate: September 29, 1967

Writer(s): John Meredyth Lucas

Director(s): Marc Daniels

Guest Stars
Blaisdell Makee as Singh
Arnold Lessing as Security Guard
Vic Perrin as Voice of Nomad
Eddie Paskey as Lt. Leslie
William Blackburn as Lt. Hadley
Meade Martin as Crewman
Roger Holloway as Lt. Lemli
Frank da Vinci as Lt. Brent

Stardate: 3541.9

Synopsis: Kirk outwits a powerful probe that threatens to kill the crew.

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