John Hopley

 was the father of Violet Hopley and the husband of Melissa Hopley.

One night, he discovered an Extron criminal was hiding out in his daughter's bedroom. He met the Tenth Doctor just before Violet was transported to the planet Onla-toch with the Extron. After the Doctor dealt with it, he returned Violet home and John gave his daughter a warm welcome home. (COMIC: The Monster Upstairs)