Time itself is in peril! The Time Lords and UNIT find themselves besieged by a mythic figure from the Time Lords' past hell-bent on destruction. The only way to defeat him is to break the First Law of Time and let the Doctor help himself — literally...

Cast:Jon Pertwee, Patrick Troughton, William Hartnell, Katy Manning, Nicholas Courtney, John Levene,

Genre:Science Fiction, Adventure, Drama,

country:United Kingdom,

Production:BBC,