Steven and Dodo break into the city of the Elders in an attempt to rescue the Doctor. But they have been detected and their escape route is cut off.

The entire human race has been blinded to a threat on its doorstep. With Armageddon fast approaching, the Doctor must act immediately. The star-studded episode - and series - concludes next Saturday.

Doctor Who Confidential is at 7.45pm on BBC3.

This episode goes behind the scenes of Bad Wolf

As the series prepares for its climax next week, has the Doctor got what it takes to prevail in his showdown with the ultimate foe? As well as Christopher Eccleston and Billie Piper, there are contributions from Russell T Davies and Noel Clarke, who plays Mickey.

David Quilter is an English actor who has made numerous appearances in UK television plays and series since the mid 1960s.

He played Greeves in the Doctor Who story The Unicorn and the Wasp.

He was born in Northwood, London and attended Bryanston School, Dorset. He made his stage debut in amateur dramatic productions and then appeared in repertory theatre.

His television appearances include; Softly, Softly: Taskforce (1967), Some Mothers Do 'Ave 'Em (1973), The Bill (1980�81), Grange Hill (2000) as Mr Arnold, Silent Witness (2001�03). He also appeared in the film The Battle of Britain (1969) as a pilot and in Jinnah (1998).

Kit Pedler was a British medical scientist, science fiction author and writer on science in general.

He was the head of the electron microscopy department at the Institute of Ophthalmology, University of London, where he published a number of papers. Pedler's first television contribution was for the BBC programme Horizon.

In the mid-1960s, Pedler became the unofficial scientific adviser to the Doctor Who production team. Hired by Innes Lloyd to inject more hard science into the stories, Pedler formed a particular writing partnership with Gerry Davis, who was story editor on the programme. Their interest in the problems of science changing and endangering human life had led them to create the Cybermen.

Pedler and Davis devised and co-wrote Doomwatch, a British science fiction television programme produced by the BBC. The programme which ran on BBC One for three seasons from 1970 to 1972 (37 50-minute episodes plus one unshown) covered a government department that worked to combat technological and environmental disasters.

Richard Todd OBE  was an Irish-born British stage and film actor and soldier.

He played Sanders in the 1982 story Kinda

Richard Todd was born in Dublin, Ireland. His father, Andrew William Palethorpe Todd, was an Irish physician and an internationalIrish rugby player who gained three caps for his country. Richard spent a few of his childhood years in India, where his father, a British officer, served as an army physician.

Later his family moved to West Devon and Todd attended Shrewsbury School. Upon leaving school, Todd trained for a potential military career at Sandhurst before inaugurating his acting training at the Italia Conti Academy.

This change in career led to estrangement from his mother. When he learned, aged 19, she had committed suicide, he admitted in later life that he had not grieved long for her.

He first appeared professionally as an actor at the Open Air Theatre, Regent's Park in 1936 in a production of Twelfth Night. He played in regional theatres and then co-founded the Dundee Repertory Theatre in 1939.

On 6 June 1944, as a captain, he participated in the British Airborne Operation Tongaduring the D-Day landings. Todd was among the first British officers to land inNormandy as part of Operation Overlord. His battalion were reinforcements that parachuted in after glider forces had landed and completed the main assault againstPegasus Bridge near Caen.  He later met up with Major John Howard on Pegasus Bridge and helped repel several German counter attacks. During the Second World War, Todd joined the British Army, receiving a commissionin 1941. Initially, he served in the King's Own Yorkshire Light Infantry before joining the Parachute Regiment and being assigned to the 7th (Light Infantry) Parachute Battalion as part of the British 6th Airborne Division.

As an actor, Todd would later play Howard in the 1962 film The Longest Day, while Todd himself was played by another actor.

After the war, Todd returned to repertory theatre in the UK. A film contract with Associated British followed in 1948. He had appeared in the Dundee Repertory stage version of The Hasty Heart, playing the role of Yank and was subsequently chosen to appear in the 1948 London stage version of the play, this time in the leading role of Cpl. Lachlan McLachlan. This led to his being cast in that role in the Warner Bros. film adaptation of the play, which was filmed in England. Todd was nominated for the Academy Award for Best Actor for the role in 1949.

He later appeared in The Dam Busters (1955) as Wing Commander Guy Gibson, probably the role for which he is best known. Americans remember Todd for his role as the United States Senate Chaplain Peter Marshall in the film version ofCatherine Marshall's best selling biography, A Man Called Peter. Todd was the first choice of author Ian Fleming to playJames Bond in Dr. No, but a scheduling conflict gave the role to Sean Connery. In the 1960s, Todd unsuccessfully attempted to produce a film of Ian Fleming's The Diamond Smugglers and a television series based on true accounts of the Queen's Messengers.

In 1953, he appeared in a BBC Television adaptation of the novel Wuthering Heights, as Heathcliff. Nigel Kneale, responsible for the adaptation, said the production came about purely because Todd had turned up at the BBC and told them that he would like to play Heathcliff for them. Kneale had to write the script in only a week as the broadcast was rushed into production.

In 1964 he was a member of the jury at the 14th Berlin International Film Festival.

In the 1970s, he gained new fans when he appeared as the reader for Radio Four's Morning Story. In the 1980s his distinctive voice was heard as narrator of the series Wings Over The World, a show about the history of aviation shown on Arts & Entertainment television. He appears before the camera in the episode about the Lancaster bomber. Todd continued to act on television, including roles in Virtual Murder and Silent Witness.

His active acting career extended into his eighties. He was appointed an Officer of the Order of the British Empire in 1993.

Both Todd's marriages ended in divorce. His first was to actress Catherine Grant-Bogle, whom he met in Dundee Repertory and was married to from 1949 until 1970; they had a son Peter (1952�2005) and a daughter Fiona. He was married to model Virginia Mailer from 1970 until 1992; they had two sons, Andrew and Seamus (1977�1997). In retirement, Todd lived in the village of Little Ponton and later in Little Humby, 8 miles from Grantham.

Two of Todd's four children committed suicide. In 1997, Seamus Palethorpe-Todd shot himself in the head in the family home in Lincolnshire. An inquest heard the suicide might have been a depressive reaction to the drug he was taking for severe acne. On 21 September 2005, Peter killed himself with a shotgun in East Malling, Kent, following marital difficulties.

His sons' suicides affected Todd profoundly; he admitted to visiting their adjoining graves regularly. He told the Daily Mail, that dealing with those tragedies was like his experience of war, "You don't consciously set out to do something gallant. You just do it because that is what you are there for."

Todd, with his own military record, was a keen supporter of remembrance events especially those associated with the Normandy landings and the Dambusters. He continued to be identified in the public consciousness with Guy Gibson, the role he played in The Dambusters.

Todd appeared at many Dambusters' anniversaries at Derwent Dam. His final appearance was in May 2008 with Les Munro (the last surviving pilot from the raid on the Ruhr dams).

The actor also narrated at least one TV documentary about The Dambusters and contributed forewords to many books on the subject, including The Dam Busters by Jonathan Falconer (2003), Filming The Dam Busters by Jonathan Falconer (2005) and most recently Bouncing-Bomb Man: The Science of Sir Barnes Wallis by Iain Murray (2009).

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

Ken Tyllssen began his career as a dancer at the Royal Ballet and then as an actor at the National Theatre.

He was a longstanding member of the Adlerian Society and Vice President for many years,

Bernard Bresslaw was an English actor. He is best remembered for his comedy work, especially as a member of the Carry On team.

he appeared in Educating Archie on radio and The Army Game on television, and was cast in Carry on Cowboy in 1965.

He featured as Varga, the lead villain in the 1968 Doctor Who story The Ice Warriors. Even though all the actors playing the aliens were over six feet tall, Bresslaw towered over them. Sonny Caldinez, who played an Ice Warrior in the story, stated in a 2004 interview that Bresslaw "was the only man that could make me feel small."

Although officially starring in 14 Carry On films, Bresslaw did appear in one other: Carry On Nurse. The legs of Terence Longdon were deemed to be too thin and scrawny looking, so Bresslaw's were used as stand-ins for the scene where Joan Sims gives him a bath.

Bresslaw's catchphrase, in his strong Cockney accent, was "I only arsked" (sic), first used in The Army Game, and later revived in Carry On Camping (1969). In his fleeting appearance as an angry lorry driver in the 1970 film Spring and Port Wine (set in Bolton), his character was dubbed.

Bresslaw performed with the Young Vic Theatre Company, the Royal Shakespeare Company and the National Theatre. One of his last stage performances was as Malvolio in Twelfth Night at the Open Air Theatre, Regent's Park.

His song "You Need Feet" (a parody of "You Need Hands" by Max Bygraves) was used in the Rutles' TV special, accompanying the Yoko Ono film parody "A Thousand Feet of Film". This was cut from the syndicated version and the original DVD release, but was restored (along with other cut footage) in later DVD releases.

Reed de Rouen was an American of half Native American (Oneida) extraction, born in Green Bay, Wisconsin, on 10 June 1917 (not 1921, as the Internet Movie Database would have it). De Rouen was a supporting actor in film and television, based in the UK and very active during the 1950s and 1960s; his earliest role known to me was as a soldier (uncredited) in The Third Man. As well as his regular film appearances, he was also on the British stage in the 1950s, in plays such as Plain and Fancy (Drury Lane Theatre, 1956) and Subway in the Sky (Savoy, 1957).

Of note to SF fans were his television appearances as Pa Clanton in "The Gunfighters", a third season adventure of Doctor Who (later novelised by David Cotton) in which the Doctor—William Hartnell—travels to Tombstone of 1881 in time to witness the gunfight of the OK corral, and in an episode of The Invisible Man entitled "The White Rabbit", about a mad scientist’s plans to create an army of invisible animals; he also appeared a couple of times in The Avengers, although in its thriller days rather than the later, as well as writing an episode, "Six Hands Across a Table" for Patrick Macnee & Honor Blackman.

His science fiction novel, Split Image (originally published in 1955 and reprinted by Panther Books (763) in 1958 and Digit Books (R728) in 1963), at least showed a modicum of originality, although it has a derivative plot about a landing on an uncharted planet that is actually a mirror of the Earth. The story follows Aldo Chandler, an ex-bomber pilot and property dealer whose folorn lovelife eventually leads him to New York and a meeting with an old friend, David Evans, who wants him to co-pilot a spaceship created by a Doctor James MacDonald. Agreeing, Aldo is later introduced to MacDonald’s wife, Isbel, with whom he falls in love with, and meets Bradley, the physicist who has helped develop the astro-magnetic powered rocket they will fly.

The first half of the book is spent flight-testing and philosophising about love, flying and how beautiful the Earth looks from on high. Unfortunately, David is killed during the first test flight and, in true space-opera style, the spaceship is blasted off course by "a huge mass of solar dust, a hundred thousand miles of it, and travelling at great speed—straight for us!" on its flight to the Moon and crashlands on the planet Dextar, where Aldo meets the Lawyers, a group of robots left by the planet’s doomed population. More philosophy (war, religion) follows until the robots allow the astronauts to return to their rocket and leave for Earth.If you are expecting a pulp novel (as I was), the book rather lumbers in comparison to most SF from the 1950s and 1960s; the coverline—"A novel of interplanetary menace"—promises something rather different to what the book actually delivers, which is a wordy anti-war, pro-life message.De Rouen's The Heretic is not SF, concerning an American who, whilst fighting on the side of the Republicans during the Spanish Civil War, is arbitrarily picked out as a scapegoat in a communist trial of supposedly Fascist agents provocateurs. Although he escapes execution, thanks to a well-timed air raid, his life is subsequently dogged by this event, his left-wing friends shunning him and anti-communists mistrusting him for his left-wing leanings. During the Korean War he becomes a symbol for both sides and undergoes a series of contradictory brainwashings and re-indoctrinations. "Mr. de Rouen writes crisply, though the style occasionally gets a little too overwrought for its own good, and he is not frightened of tackling a big theme," claimed the reviewer for The Times (2 April 1964). "His novel inevitably recalls the world and some of the attitudes of Mr. Arthur Koestler, and does not suffer unduly from the comparison."

Reed De Rouen also wrote a number of teleplays for various series, including Ghost Squad, Crane, The Man in Room 17 and Man in a Suitcase (where he also appeared in one of his own scripts), and co-wrote an unproduced Doctor Who story with Jon Pertwee in 1970. His last film appearance (to my knowledge) was in 1972, and some years later—in 1979—he collaborated on a crime novel, Death List, which appeared as a paperback original from Futura. I’ve not seen this later novel and whether De Rouen wrote any others is unknown, but his two known novels give him a place in the canon of British paperback authors—and not many paperback authors can say they welcomed Joseph Cotten to Vienna in one of Britain’s greatest movies!De Rouen died in London on 11 June 1986. He was married to Laila S. de Rouen (b. Benton, Montana, 22 June 1923) and they had at least one son, Reed R. de Rouen Jr. (b. Butte, Montana, 3 October 1946); De Rouen was married again to Claire Aplhandéry in in the early 1950s and had another son (Robin, b. 1955).

Norman Claridge played the Priest in the 1966 Doctor Who story The Massacre of St Bartholomew's Eve.

Also worked on Brothers and Sisters, Disraeli, The Aweful Mr. Goodall, The Edwardians, The Moonstone, Softly Softly: Task Force, Brett, The Mind of Mr. J.G. Reeder, Mr. Forbush and the Penguins, The Main Chance, Tom Grattan's War, Clegg, Special Branch, Counterstrike, Dixon of Dock Green, Softly Softly, Gazette, Torture Garden, The Informer, The Beverly Hillbillies, Comedy Playhouse, The Old Campaigner, They Came from Beyond Space, Z Cars, Broome Stages, The Troubleshooters, Ghost Squad, The Scales of Justice, Garry Halliday, Out of This World, Looking About, Emergency, Frontier Drums, Womaneater, ITV Play of the Week, ITV Television Playhouse, Terminus, Crow Hollow, BBC Sunday-Night Theatre, The Dark Man, The Small Voice, King Lear, Mr. Jones Dines Out, The Fame of Grace Darling, The Ringer, Dance Pretty Lady