The TARDIS lands in ancient Egypt at the Great Pyramid. The Daleks and the Meddling Monk also arrive in pursuit of the Doctor. The Monk is forced into an alliance with the Daleks.

A captive of the guerrillas, the Doctor discovers they intend to change history. Jo is transported to the 22nd Century where she unwittingly gives vital information to the Daleks.

Captured by primitive tribes-men, the Doctor faces the 'Ordeal of the Horda'.

Stephen Hawking is an English theoretical physicist, cosmologist, author and Director of Research at the Centre for Theoretical Cosmology within the University of Cambridge.

Among his significant scientific works have been a collaboration with Roger Penrose on gravitational singularity theorems in the framework of general relativity, and the theoretical prediction that black holes emit radiation, often called Hawking radiation. Hawking was the first to set forth a cosmology explained by a union of the general theory of relativity and quantum mechanics. He is a vocal supporter of the many-worlds interpretation of quantum mechanics.

William Hartnell was the actor who originated the role of the Doctor in the 1960s, playing the first incarnation of the character for BBC Television from 1963 to 1966.

Emerging from a difficult family background about which he was later evasive, Hartnell held down a succession of short-term odd jobs before turning to acting in the 1920s. He enjoyed success as a touring repertory actor, and in the 1930s began appearing in films, particularly the "quota quickies" companies were obliged to release to fulfil their obligations to promote British film. Here Hartnell developed his talents as a light comedy actor, but it was not until the Second World War that his reputation began to flourish. After being invalided out of the army, he appeared as the sergeant in the well-received propaganda piece The Way Ahead, and this helped him to develop a reputation for such tough-guy roles that won him many major supporting parts. Of all the actors to have played the Doctor he had the most successful film career, with major roles in landmark films such as Brighton Rock, as the eponymous sergeant in Carry On Sergeant and, cast against type in a sensitive character part, in the film version of This Sporting Life.

It was this role that led producer Verity Lambert to offer him the part of the Doctor. Although Hartnell was initially uncertain about it, Lambert and director Waris Hussein persuaded him to accept the part, and it became the role for which he is best remembered, making him a household name in 1960s Britain. Hartnell became incredibly attached to the role and particularly enjoyed the attention and affection it brought him from children, groups of whom would follow him around his local village. He would often happily open fetes and other functions in costume and character as the Doctor. Although ill health forced him to reluctantly relinquish the part in 1966, he remained fond of the series and in 1972, with his health rapidly deteriorating even further, battled his failing memory to film one final performance as the character in the tenth anniversary special The Three Doctors, which aired between December 30, 1972 and January 20, 1973. It was his final professional performance; he died on April 23, 1975, aged 67.

The actor is played by David Bradley in the 50th Anniversary drama An Adventure In Space And Time.

Actor who appeared in the 1965 story The Crussade.

Had a long career in Television and Films including roles in Emmerdale, A Tale of Two Cities and The Avengers.

Bruce Wightman appeared in several Doctor Who stories: as William de Tornebu in The Crusade, Scott in The Daleks' Master Plan, and a Radio Operator in Terror of the Zygons.

Tom Bowman played a Sentry in the Doctor Who story The Highlanders.

Also worked on C.O.D. , Disneyland, Diamonds on Wheels, Innocent Bystanders, The Troubleshooters, Randall and Hopkirk, Z Cars, Out of the Unknown, Detective, Dixon of Dock Green, The Informer, Man in a Suitcase, The Trygon Factor, King of the River, I've Gotta Horse, Circus of Fear, Court Martial, Where the Bullets Fly, Danger Man, The Wednesday Play, Clash by Night, Miss Adventure, Espionage, R3, Boyd Q.C., Ghost Squad, The Primitives, Richard the Lionheart, ITV Play of the Week, Sir Francis Drake, H.M.S. Defiant, Studio 4 , The Frightened City, Four Winds Island, The Pursuers, The Strange World of Gurney Slade, Village of the Damned, Too Hot to Handle, SOS Pacific, Hot Money Girl, In the Wake of a Stranger, Idol on Parade, The Witness, The Secret Man, Harry Black, Ivanhoe, O.S.S., The Surgeon's Knife, The Steel Bayonet, Yangtse Incident: The Story of H.M.S. Amethyst, BBC Sunday-Night Theatre, The Crime of the Century, The Men of Sherwood Forest 

Dudley Foster was an English actor..

He appeared in such series as Danger Man, The Saint, The Avengers, Steptoe and Son and Doctor Who (The Space Pirates), often in villainous roles; in Z Cars, he played a police detective. He occasionally appeared in films.

In 1970 he provided the voice-over for an edition of the BBC documentary series Chronicle: "The Great Iron Ship", about the salvage and return from the Falkland Islands of the Isambard Kingdom Brunel ship SS Great Britain.

His early death was the result of suicide.

Hamilton Dyce was a British film and television actor.

He appeared in Whistle Down the Wind (1961), Dr. Crippen (1962), Mrs. Gibbons' Boys (1962), Becket (1964), Master Spy (1964), The Comedy Man (1964), King Rat (1965), Sky West and Crooked (1966), The Wrong Box (1966), Two Gentlemen Sharing (1969), Unman, Wittering and Zigo (1971), The Pied Piper (1972)