The TARDIS arrives on another part of the island and the Doctor and his companions Jamie and Zoe hear the explosion of the craft being destroyed. They take shelter in the museum and meet three other newly arrived Dulcians, Educator Balan and his young charges Teel and Kando. All are puzzled that the radiation reading on the Island is nil, since it should be radioactive after the nuclear explosion 172 years earlier. Cully arrives too, and tells them about the murderous Dominators and their robots. Balan does not accept this: Cully, the son of the Director of the ruling council, is well-known as a practical joker.