Bio: Sir Justin was a medieval knight, perhaps inspired by Arthurian legend. He was a companion of the Fifth Doctor for a single adventure. However, the unusual amount of time and space travel in that adventure may be said to imply that Justin actually traveled with the Doctor for a considerable length of time.
Like the televised Katarina, he believed the Doctor to be more Lord than Time Lord.
He resolved the plot of "The Tides of Time" by laying down his life.
Notes: Not to be confused with DC's rather well-developed character based on the Arthurian legend, sometimes called the Shining Knight.