After being caught up in a web-like substance on its journey through space, the TARDIS arrives in the tunnels of the London Underground railway system, only to find the web also in the tunnels - as is the Great Intelligence's Yeti.
How has this happened? The team learn that the impending disaster was triggered nearly forty years before, after their previous encounter with the Intelligence. Professor Travers accidentally reactivated a Yeti, thus giving the Intelligence the ammunition it needed to plan another invasion attempt.
The aim is simple: the Intelligence wants to drain the Doctor's mind. Army forces, led by Colonel Lethbridge-Stewart, help the Doctor and his team race against time to stop them in their mission. Can they make it?
Description:
How has this happened? The team learn that the impending disaster was triggered nearly forty years before, after their previous encounter with the Intelligence. Professor Travers accidentally reactivated a Yeti, thus giving the Intelligence the ammunition it needed to plan another invasion attempt.
The aim is simple: the Intelligence wants to drain the Doctor's mind. Army forces, led by Colonel Lethbridge-Stewart, help the Doctor and his team race against time to stop them in their mission. Can they make it?