Page "Arena (Star Trek: The Original Series)" Paragraph 14

* According to an account by Herbert Solow in the book Inside Star Trek, The Real Story, the relation to Brown's story may have been an unconscious inspiration.

After Coon had written what he thought was an original script, Desilu's research department noted the similarity.

It was therefore agreed that Desilu's Business Affairs office would call Brown and offer a fair price for the story, before it was shot and broadcast.

Brown agreed without knowing that the story had already been written.