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EPISODE
The Alternative Factor
Attribution
Series:	The Original Series
Written by:	Don Ingalls
Directed by:	Gerd Oswald
Production information
Episode no.:	1x20
Production no.:	6149-20
First aired:	30 March 1967
Chronology
Date:	3087.6 (2267)

Summary

References

Characters

Barstow • Brent • Hadley • Harrison • James T. Kirk • Lazarus • Ed Leslie • Charlene Masters • Spock • Nyota Uhura

Starships and vehicles

USS Enterprise (Constitution-class)

Locations

Races and cultures

Human • Vulcan

States and organizations

Other

Appendices

Related Stories

Timeline

published order
Previous episode: Arena	TOS episode produced	Next episode: Tomorrow is Yesterday
Previous episode: Errand of Mercy	TOS episode aired	Next episode: The City on the Edge of Forever
Previous story: first story	Star Trek 10	Next story: The Empath
chronological order
Previous Adventure: A Vulcan, A Klingon, and an Angel (Backstory)	Pocket	Next Adventure: Tomorrow is Yesterday
Previous Adventure: Arena	Voyages of the USS Enterprise (NCC-1701) (2264 to 2270)	Next Adventure: Tomorrow is Yesterday

Images

The USS Enterprise destroys Lazarus's vessel from orbit

External link

• The Alternative Factor (episode) article at Memory Alpha, the wiki for canon Star Trek.