The Third Doctor and Sarah arrive in 1970s London to find it has been evacuated because dinosaurs have appeared mysteriously. It turns out the dinosaurs are being brought to London via a time machine to further a plan to revert London to a pre-technological level.
Jon Pertwee
as The Doctor
Elisabeth Sladen
as Sarah Jane Smith
Nicholas Courtney
as Brigadier Lethbridge-Stewart
Richard Franklin
as Mike Yates
John Levene
as Sergeant Benton
Noel Johnson
as Sir Charles Grover
Peter Miles
as Professor Whittaker
Martin Jarvis
as Butler
John Bennett
as General Finch
Terence Wilton
as Mark
Carmen Silvera
as Ruth
Brian Badcoe
as Adam
