Re: Prometheus: Ridley Scott returns to Sci-Fi
"Alien Harvest" is indeed a fan script which was originally thought to be an early draft of what is now "Prometheus". The script writer credited with writing "Shadow 19" and "Passengers" (which Keannu Reeves was attached to for a while) is named Jon Spraits and has script credit for "Prometheus". Damon Lindelof was signed to write "Prometheus" from the the very start IIRC. Spraits we don't actually know what he was given for I believe, only these two have credit for writing "Prometheus".
Chief of Operations
Ignoring the The Last Stand since 2011.