Dynes first met the Fifth Doctor and Peri when they became involved in the search for the legendary treasure of Rovan Cartovall, which had been missing for five thousand years. Dynes followed the Marquis de Rosscarrino and his niece Arnella, accompanied by Professor Thorrin and his assistant Willis Brockwell, to the planet Gelsandor, where it was believed the treasure was hidden. Dynes was allowed to record the others as they went on a quest to prove their worthiness to receive the treasure, the Gelsandorans wishing to observe them to better understand humanity. However, at the quest's end, Dynes was left alone on the planet as the others either died or left on their own, lacking any reason for his time away as the films from his cameras had been removed; the Gelsandorans had allowed him t