The science-fiction legend Harlan Ellison died June 28, 2018. His script for the “City on the Edge of Forever” episode was changed significantly but he was still given exclusive credit for the screenplay, which he considered a betrayal, one that he held a decades long grudge for. Vox covers this in a piece that examines this episode how it represents a microcosm of Ellison’s life.
“City on the Edge of Forever” is a brilliant episode in a series known for greatness. I can understand how Ellison would be upset with the changes to his script, even after its success. That he held a grudge for so long and so virulently tells us what a brilliant and tortured soul he was.