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
CinemaSerf
Returning from her first adventure with the doctor in the TARDIS, "Sarah Jane" (Elisabeth Sladen) gets a bit more of the action as she and the "Doctor" (Jon Pertwee) discover a London that's been evacuated after a spate of dinosaur attacks. After an altercation with the army over a fur coat, they re...