STORY
Summoned back to Earth by the Brigadier, the Doctor investigates a series of mysterious attacks on North Sea oil rigs. Centre of the attacks is the village of Tullock, very close to Loch Ness. The Doctor discovers that the cause of these attacks is the Loch Ness Monster, in reality a Skarasen, a creature half-animal, half-machine, created by the Zygons, an alien race whose crippled spaceship has rested on the bottom of the Loch for centuries. Unable to return home (their planet was destroyed), the Zygons plan to take over Earth and turn it into a new home planet for their race. Able to change form and take on the physical appearance of Humans, the Zygons have infiltrated the village. The Doctor exploses the Zygons and frees their captives, including the local Duke. The Doctor blows up the Zygon ship but Broton, leader of the Zygons, now in London, threatens to destroy a World Energy Conference. He is stopped by the Doctor. The Skarasen survives to swim happily back to Loch Ness.

CAST

COMPANIONS & CHARACTERS
 

VILLIANS

Tom Baker as:

THE DOCTOR
 

John Woodnutt as:

BROTON

         

Elisabeth Sladen as:

SARAH JANE SMITH
 

Keith Ashley as:

ZYGONS

         

Ian Marter as:

HARRY SULLIVAN
 

THE SKARASEN

         

Nicholas Courtney as:

BRIGADIER
 

Robert Russell as:

THE CABER

         

Lillias Walker as:

SISTER LAMONT
     
         

John Woodnutt as:

DUKE OF FORGIL
     

 

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