Tom Baker as the doctor, his first episode. It is brilliant to see him and sad to see Jon Pertwee go.

The story line not only includes a brilliant costume change scene, whereby the Doctor tries to define his image, a crazed Robot and the brilliant Brigadier!

The entire story is about a group of scientist on Earth who are part of an organisation called ‘Think Tank’. They are to create a new world order based upon the leadership of the elite. The scientific elite.

The Robot element in this story arch is a Robot created by their founder who is the hunter and gather of the group and generally does all of the dirty work.

They try to take control of the Earth by steeling the codes to launch all of the Nuclear missiles and the Robot goes mad with the conflict as he has a intelligence and prime directive not to hurt Humans.

And it is created out of a living metal which enables it to grow to a size that makes it dwarf the other people following the Brigadier trying to destroy it with a Ray Gun.

The Doctor, now fully aware of himself, creates a solution that will attack the metal of the deranged Robot.

The day is won, and not only does the Doctor have a new body but a new assistant alongside Sarah Jane Smith – Harry.

The Doctor, played by Jon Pertwee, is trying to keep an eye on a group of scientists are dabbling in elements that always lead to some kind of disaster. Yes, they are trying to penetrate the Earth’s crust.

In a secluded location the Government is carrying out secretly drilling operations to tap an ancient power source know as ‘Stahlman’s Gas’. This has been around since the dawn of the universe. At the same time the Doctor is trying to ‘kick start’ his Tardis with the power from the onsite power station.

All is not well, a humble engineer gets exposed to a mysteries green liquid and is transformed into a feral primordial man, that is so hot that everything, bar his clothing seems to be burned.

During one of his experiments with the Tardis he is transport to a parallel earth that is ruled by a powerful dictatorship. In this we see a one eyed Brigadier who is anything but nice and Liz Shaw as authoritarian Section Leader Shaw.

This Earth is suffering the same problems as The Doctor’s Earth in our dimension but they are advanced.

The Doctor struggles to try to save the parallel Earth, but it is too late but not for our Earth.

The Doctor returns to his own dimension and uses the lessons he has learned to save the day.

This episode has the full array of the Jon Pertwee era, Liz Shaw as his assistant, the Brigadier, Sergeant Benton and of course random shooting at creatures and The Doctor!

A brilliant story line that will make old and new fans smile!