Carl Thascalos

Professor Carl Thascalos, or Thascales, was an alias used by the Master (AUDIO: Mastermind) to primarly work at the Newton Institute on TOMTIT, experimenting and researching into interstitial time. Like other aliases, Thascalos was Greek for master, as pointed out by Jo Grant. (TV: The Time Monster)

At some point, Thascalos gave a copy of the Necronomicon to Jamie McCrimmon while he was travelling with the Second Doctor to lure them to the Archons. (PROSE: The Nameless City)

Jeremy Winterdawn later accquired Carl Thascales's notes on interstitial time and began his own experiments, stating that Thascales had died after driving his car into a wall, his body burned beyond all recognition. (PROSE: Falls the Shadow)