Wenton

Ethan Wenton initially acted as peacemaker during the dispute, which involved his girlfriend and a group of men, before brutally lashing out at his stricken victim.

As they watch the ghost take Wenton-Weakes' body out towards the ship, MacDuff gets a call from Susan (due to mixed-up utility connections in the flat) and learns of Ross's murder.

Gently realises that the ghost must have used Wenton-Weakes to kill Ross, and asserts they need to stop the ghost before it can repair the ship, which would prevent the formation of life on earth.

With this action, the ghost is able to fully possess Wenton-Weakes' body.