The Invasion

When the Doctor, Zoe (hurray!) , and Jamie investigate the mysterious dissapearance of an eminant scientist, their search takes them to International Electromatics, a powerful firm run by the sinister Tobias Vaughn. Under surveillence by the Brigadier's top secret United Nations Task Force, it soon becomes apparent that there is more to Vaughns activities than meets the eye. Just who are his mysterious allies? What is lurking down the sewers of London? Is the Doctor ready to face an old enemy once more?

An absolute classic adventure, beutifully written and acted, the pace is perfect and the story riveting. The video is linked over the missing episodes by the distinguished Nicholas Courtney.
On the Zoe front, this story showcases her well, not only do we get a fair quantity of her, she gets to save the world.
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