Retired commander of the United Nations' Intelligence Taskforce, and long-time associate of the mysterious time traveler the Doctor, Brigadier Alistair Lethbridge-Stewart faces the toughest battle of his military career when he is embroiled in a plot unwittingly set in motion by university chancellor Victoria Waterfield, herself a former companion of the Doctor, to take over the Earth by an evil alien entity called the Great Intelligence, aided by its ferocious robot Yeti cohorts. Can the Brigadier defeat this menace to the Earth without the Doctor's help?
Nicholas Courtney
as Brigadier Alistair Gordon Lethbridge-Stewart
Elisabeth Sladen
as Sarah Jane Smith
Deborah Watling
as Victoria Waterfield
Jack Watling
as Professor Travers
Geoffrey Beevers
as 'Harrods' Haroldson
Peter Silverleaf
as Christopher Rice
John Leeson
as Anthony the D.J.
Miles Richardson
as Captain Douglas Cavendish
Beverley Cressman
as Kate Lethbridge-Stewart
Zeb Soanes
as Chilly
Mark Trotman
as Daniel Hinton
James Bree
as Lama
