When scientists start to go missing in the 20th century, the Doctor is called in by the Brigadier to investigate. His investigations lead him to deduce that they are being kidnapped through time and he sets off in pursuit, unknowingly kidnapping journalist Sarah Jane Smith in the process. Arriving in the middle ages, the Doctor and Sarah find themselves caught up in the machinations of the robber baron Irongron and his man from the stars. The alien, a Sontaran named Linx, is arming him with modern weapons in return for helping him repair his damaged ship, and it's up to the Doctor and Sarah to stop him from ruining the Earth's timeline.
Jon Pertwee
as The Doctor
Elisabeth Sladen
as Sarah Jane Smith
Nicholas Courtney
as Brigadier Lethbridge-Stewart
Kevin Lindsay
as Linx
David Daker
as Irongron
John J. Carney
as Bloodaxe
Alan Rowe
as Edward of Wessex
June Brown
as Lady Eleanor
Jeremy Bulloch
as Hal
Donald Pelmear
as Professor Rubeish
Sheila Fay
as Meg
Gordon Pitt
as Eric
