Television writer Gene Roddenberry, who has already written scripts for shows such as Have Gun, Will Travel, writes his first-draft series proposal for a new hour-long science fiction drama, which he calls Star Trek. The series involves the starship S.S. Yorktown, commanded by Captain Robert April. Roddenberry will spend several months refining his concept before it is bought by Desilu Studios and shopped around to the American television networks. At the time he’s writing the pitch, Roddenberry is still overseeing his latest TV creation, a military series called The Lieutenant, which has enjoyed decent ratings but is leaving its network, NBC, nervous with its tendency to deal directly with issues related to the widening conflict in Vietnam.
At Hollywood’s Desilu Studios, filming begins on 
Halfway through filming on the Star Trek pilot episode, 
Filming begins on a nearly-unprecedented second pilot episode of Gene Roddenberry’s Star Trek at the request of NBC, which saw promise (but not enough action) in The Cage. When Jeffrey Hunter declines to return to the role of Captain Christopher Pike, the character is renamed (Captain James R. Kirk) and recast (in the person of well-regarded Canadian actor William Shatner). The first edit of the new episode, 
NBC announces that it has added a new full-color hour-long science fiction series, Gene Roddenberry’s Star Trek, to its fall 1966 schedule. Unusually, the show has produced two wildly different pilot episodes, with NBC having asked for specific changes to the series format as early as 1965, when it passed on the original pilot, The Cage. One change specifically requested between pilots by NBC, the omission of a “Satanic” alien character named Mr. Spock, doesn’t prevent the network from ordering 16 episodes from Desilu Studios.
With over two years of development behind it, Gene Roddenberry’s 
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