"It was nice to bring Cassandra back. We were down on the Gower for the exterior stuff. I worked on The Intensive Care Unit, the bay of pods with the zombies in. It was red originally and it became green, like a Borg ship. The Doctor had to open one of the pods with his sonic. I included a nod to a scene in The Ark in Space when the Doctor used the sonic screwdriver to unscrew a bolt on the floor. When the Doctor opened the pod, I included a disc that resembled the screw in The Ark in Space that would turn with the sonic. That was a real fanboy indulgence! Mark Cordory built the door mechanism. Mark was a big fan too. He’s a really good friend actually. I haven’t seen him for years but I thoroughly enjoyed working with him on the various hand props used in the episodes. Like me he was involved from day one."

-- concept artist Matthew Savage on his work for New Earth, in an interview with WhoFX