The Master, in the guise of Professor Thascalos, has constructed at the Newton Institute in Wootton a device known as TOMTIT - Transmission Of Matter Through Interstitial Time - to gain control over Kronos, a creature from outside time. The creature is summoned but proves to be uncontrollable.
The Doctor
Jo Grant
The Master
Brigadier Lethbridge-Stewart
Captain Mike Yates
Sergeant Benton
Galleia
Dr. Ruth Ingram
Stuart Hyde
Dr. Percival
Dr. Cook
Krasis
Hippias
Neophite
Proctor
Kronos
Dalios
Crito
Lakis
Miseus
Minotaur
