The futuristic "blasters" used by human personnel in this serial (and by the Master, when impersonating a human officer) appear to be slightly modified replicas of the Mauser C96 "Broomhandle" pistol, with additional attachments to the barrel and sights. Three-four years later, almost the same design would be used to construct Han Solo's blaster pistol in Star Wars: Episode IV - A New Hope (1977).
The Ogrons' role in the story was originally filled by the Cybermen.