The initial screenplay was written by Transcendence screenwriter Jack Paglen in June 2013. In March 2014, Michael Green was hired to rewrite Paglen's script. Dante Harper later wrote a new script but an extensive rewrite was performed by screenwriter John Logan. Logan had previously worked with Scott on Gladiator. For Logan, the main concept was to adopt a dual plot line for the film which would combine the horror elements of Alien with the philosophical elements of Prometheus. He said, "With Alien: Covenant, I just really wanted to write something that had the feel of the original Alien, because seeing that movie was one of the great events of my youth. It was so overpowering in terms of what it communicated to me and its implications, that when I started talking to Ridley about what became Alien: Covenant, I said, 'You know, that was a hell of a scary movie. ' I wanted to write a horror movie because the Grand Guignol elements of Alien are so profound. We tried to recapture that with Alien: Covenant, while also trying to pay homage to the deeper implications of Prometheus. In terms of tone, pace, and how we chose to play this particular symphony, we wanted to create a really frightening movie. "