During the time Cusick was working on Doctor Who, he was developing an interest in photography and brought his camera with him while he was working. During camera rehearsals of the stories he worked on, he took a great many behind-the-scenes photographs.
Cusick's pictures still exist today as a fascinating record of Doctor Who behind the scenes in the 1960s, and have appeared in such publications as Doctor Who Magazine.
- The Daleks (with Jeremy Davies)
- The Edge of Destruction
- The Keys of Marinus
- The Sensorites
- Planet of Giants
- The Rescue
- The Romans
- The Chase (with John Wood)
- Mission to the Unknown (with Richard Hunt)
- The Daleks' Master Plan (with Barry Newbery)