"The Alternative Factor"

For more about “The Alternative Factor,” and all the episodes from the first season of Star Trek: The Original Series, read These are the Voyages – TOS: Season One, by Marc Cushman with foreword by John D.F. Black, due August 5, 2013 by Jacobs/Brown Press. 

Watch for These are the Voyages – TOS: Season Two and Season Three, due later in 2013.
"I had to force myself to close [These are the Voyages, TOS, Season One]. Wow! It would be a bargain at ten times your set price. Fans the world over will be making comments of gratitude for years to come." - Curtis Fox startrekpeople.com.