Guest Stars

James Doohan voiced Ensign Dawson Walking Bear, Kukulkan Recurring	Majel Barrett voiced Female Yeoman Recurring

Main Cast

William Shatner voiced Captain James Tiberius Kirk	Leonard Nimoy voiced Commander Spock
DeForest Kelley voiced Dr. Leonard Horatio "Bones" McCoy	James Doohan voiced Lt. Cmdr. Montgomery "Scotty" Scott, Lt. Arex
Nichelle Nichols voiced Lt. Uhura

Recap

The Enterprise is tracing an unknown alien space probe that scanned the Federation, going back along its projected route. The probe self-destructed before it could be captured. As they start to lose the trace, they reduce speed and detect a vessel at extreme range, coming in on the same course as the probe. Kirk has the acting helmsman, Ensign Walking Bear, reduce speed. As it approaches, they determine it is twice the Enterprise's size, made of crystalline ceramic, and surrounded by a unique energy field. The vessel attacks and the Enterprise loses speed as they are surrounded by a globular force field, flexible enough to absorb any force...

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• Creator	Gene Roddenberry
• Producer	Lou Scheimer  |  Norm Prescott
• Associate Producer	D. C. Fontana
• Story Editor	D. C. Fontana
• Art Director	Don Christensen
• Supervising Director	Hal Sutherland
• Production Manager	Rock Benedetto
• Executive Consultant	Gene Roddenberry
• Special Effects	Reuben Timmins