The TARDIS lands in the London Underground, which is deserted. Jamie and Victoria are captured by the military. The Doctor is amazed to discover that Yetis are in the tunnels.

The Doctor and Jo have been miniaturised and trapped inside a Miniscope, the property of showman Vorg. The Scope has been impounded on the planet Inter Minor and may be destroyed.

Ben Turner is a British Iranian actor, most notable for his role as nurse Jay Faldren on BBC's Casualty.

He played Louis XV in the 2006 Doctor Who story The Girl in the Fireplace.

He was educated at Dulwich College, then trained as an actor at Guildhall School of Music and Drama.

Turner has worked in television, film, theatre and radio

He has appeared in several charity shows such as Children In Need, 2009 in the Casualty special as Staff Nurse Jay Faldren. He has also been in Lets Dance for Sport Relief 2010.

Originally from Australia, Mat King has directed a number of programmes in the UK, including Law and Order UK, MI: High and Holby City.

Warwick Davis has had a sci-fi/fantasy career encompassing roles such as Wicket in Return of the Jedi, the titular role in Willow, the Leprechaun films, and Professor Flitwick and the goblin Griphook in the Harry Potter films.

He was also inside Marvin The Paranoid Android in the film version of The Hitchhiker's Guide To The Galaxy.

On television he has most recently been seen as "himself" in Life's Too Short.

Kirsty Wark is a British journalist and television presenter best known for fronting the BBC Two's news and current affairs programme Newsnight since 1993, and its weekly arts annexe Newsnight Review which is now relaunched as "The Review Show".

Peter Gilmore (born in Leipzig, Germany) was a British actor, best known for his portrayal of Captain James Onedin in the BBCTelevision period drama The Onedin Line. He also had roles in 11 Carry On films and played the heroic lead in the adventure film Warlords of Atlantis. He played Brazen in the 1984 series Frontios.

In addition, Gilmore played the role of a young soldier in the World War I satirical musical Oh! What A Lovely War (1969).

He was once married to Worzel Gummidge actress Una Stubbs. At the time of his death, Gilmore was married to actress and Onedin Line co-star Anne Stallybrass.

_{Biography from the Wikipedia article, licensed under CC-BY-SA} 

Martin Lisemore was Production Assistant for 1968 Doctor Who story The Enemy of the World.

He later became a producer responsible for many period drama series and adaptations, including The Woodlanders, The Spoils of Poynton, and adaptations of Sense and Sensibility in 1971 and Emma the following year.

He quickly established himself as a leading producer of classic period drama, often working in partnership with script editor Betty Willingale. He achieved arguably his greatest success with the dramatisations of How Green Was My Valley (1975-76) and I Claudius (1976), the later winning both BAFTA and Emmy awards.

On 3 February 1977, during the production of his next series, Murder Most English, Lisemore was killed in a road accident.

He was maried to Sarah Lisemore, who appeared in The Enemy of the World.