Richard Mace found that a group of Terileptils planned mass murder against the human race on Earth in 1666. However, they were defeated by the Fifth Doctor before they could do so. (TV: The Visitation)
Mass murder
Richard Mace found that a group of Terileptils planned mass murder against the human race on Earth in 1666. However, they were defeated by the Fifth Doctor before they could do so. (TV: The Visitation)