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 reunite with "UNIT" and work to help the "Brigadier" (Nicholas Courtney) get to the bottom of things. What puzzles them is that these great beasties appear, fleetingly, then disappear - they don't seem to do much damage, just frighten folks. With the military and the politicians involved and nobody sur...