Linx is providing advanced weaponry to Irongron and his men who prepare to attack Sir Edward's castle. The Doctor is forced to improvise a defence, but will it be enough?

Mekhi Phifer is an American actor. He is best known for his multi-year role as Dr. Greg Pratt on NBC's long-running medical drama ER and his co-starring role opposite Eminem in the feature film 8 Mile. He was a regular on the Fox crime show Lie to Me in the role of Ben Reynolds, before season 3, and also starred as CIA agent Rex Matheson in Torchwood: Miracle Day.

Phifer was born in Harlem, New York City.

In 1995, Phifer attended an open casting call for director Spike Lee�s Clockers, beating over a thousand others to get the lead role as a narcotics dealer embroiled in a murder cover-up. He followed that role with another in the comedy spoof feature High School High (which also starred his former wife Malinda Williams) and continued by co-starring in the fright flick I Still Know What You Did Last Summer, starring Jennifer Love Hewitt and Freddie Prinze, Jr.

He is perhaps best known for his role as Dr. Gregory Pratt on the medical drama ER, that he started in April 2002. Phifer left the show in September 2008, in the first episode of Season 15. His character was tragically killed off in the conclusion of the season 14 finale cliffhanger involving an ambulance explosion that was rigged to kill an injured FBI informant (Steve Buscemi). During his 6 years in the show, he was nominated twice for an NAACP Award.

Phifer�s television credits include the movies The Tuskegee Airmen (1995), HBO's Subway Stories: Tales from the Underground (1997), and Brian's Song (2001) (as former Chicago Bear Gale Sayers). He received additional notice for his performance opposite singer Beyonc� Knowles (from Destiny�s Child) on MTV�s alternative take on the Carmen legend with the movie Carmen: A Hip Hopera (2001). Phifer guest-starred in the series Homicide: Life on the Street and New York Undercover. Likewise, he earned an NAACP Image Award nomination for another TV movie, A Lesson Before Dying, opposite Don Cheadle. In 2009, Phifer began a guest-starring arc on the Fox drama Lie to Me.

Among Phifer�s other big-screen credits are Soul Food, The Biography of Spud Webb, Hell�s Kitchen, NYC, Tears of a Clown, O (as the titular character Odin a.k.a. O), and the thriller Uninvited Guest (as Silk). He appeared in Impostor as well as Paid in Full and director Curtis Hanson�s 8 Mile, opposite Eminem. He is mentioned in the Grammy and Academy Award winning song "Lose Yourself" by Eminem.

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Bernard Padden  played Tylos in the Doctor Who story Full Circle. 

He was interviewed in 1980 for the regular role of Adric but lost out to Matthew Waterhouse.

He was among those interviewed for the documentary "All Aboard the Starliner" included in the serial's DVD release.

Also worked on Zemanovaload, Without You, The Dark Room, The Legend of 1900, Sunnyside Farm, Grange Hill, The Wind in the Willows, As Time Goes By, Erik the Viking, Little Dorrit, Binky and Boo, Valentine Park, Zastrozzi: A Romance, The Bride, Dempsey and Makepeace, Flat Bust, Emmerdale, How We Used to Live, Nightingale's Boys, The Dustbinmen

Alan David is a Welsh television actor. 

David was born in Merthyr Tydfil, Glamorgan. He has had many television credits ranging from Coronation Street in 1973 to Virtual Murder (1992), Honey for Tea and "The Unquiet Dead", an episode of Doctor Who in 2005. He also appeared as the 'rival' of Boycie as Llewellyn in The Green Green Grass. In 2007 he played Griff in the BBC series Gavin & Stacey.

After working in repertory at the Belgrade Theatre, Coventry and the Victoria Theatre, Stoke, David was a regular performer with the Royal Shakespeare Company between 1970 and 2003, most notably as Touchstone in As You Like It (1977), various r�les in the 1986 revival of Nicholas Nickleby and Polonius in Hamlet (2001). His regular London appearances include parts at the National Theatre, Almeida Theatre and Royal Court Theatre.

Also starred alongside John Thaw (late) in an episode of MORSE. The episode was TWILIGHT OF THE GODS Series 7, Episode 3 and was first aired on 20 January 1993

Bernard Cribbins began his professional career at the age of 14 as a student at the Oldham Repertory Theatre, remaining there for eight years with a break to do his National service in the Parachute Regiment! From Oldham he went onto work in rep at Manchester, Liverpool and Hornchurch.

His first West End appearance was in 1956 at the Arts Theatre playing the two Gromios in A COMEDY OF ERRORS; this was followed by leading roles in the West End in HARMONY CLOSE, THE LADY AT THE WHEEL, NEW CRANKS, THE BIG TICKLE and HOOK, LINE AND SINKER. He co starred in the revue AN ANOTHER THING at the Fortune Theatre, and made a number one with a song from the show entitled 'Folksong'. He went on to top the charts with 'Hole in the Ground' and 'Right Said Fred'.

He co starred in the first productions of NOT NOW DARLING, THERE GOES THE BRIDE and RUN FOR YOUR WIFE all in the West End. The latter re opened the Shaftesbury Theatre as the 'Theatre of Comedy'.

He played Nathan Detroit in the National Theatre's production of GUYS AND DOLLS and Moonface Martin in ANYTHING GOES with Elaine Paige at the Prince Edward Theatre. He played Doolittle in MY FAIR LADY at the Houston Opera House, USA and Watty Watkins in Gershwin's LADY BE GOOD at the Open Air, Regent's Park and on tour.

Cribbins returned to the National Theatre to play Otto, the magician in LA GRANDE MAGIA by Eduardo de Filippo, directed by Richard Eyre.

Bernard's numerous pantomime roles include Ada the Cook in DICK WHITTINGTON at Wimbledon, Leeds and Richmond; Widow Twankey in ALADDIN at Richmond; and Hans Anderson in THE SNOW QUEEN at Guildford.

He played Mutley in BLACKBALL, directed by Mel Smith; Mr Perks in THE RAILWAY CHILDREN, for which he was nominated for a BAFTA award; THE WRONG ARM OF THE LAW and TWO WAY STRETCH with Peter Sellers; THE WATER BABIES with James Mason; CARRY ON JACK, CARRY ON SPYING and CARRY ON COLUMBUS; CROOKS IN CLOISTERS.

On Television he played  Frank (regular) in DOWN TO EARTH for BBC TV; Wally Bannister in CORONATION STREET for Granada TV; Gavin in LAST OF THE SUMMER WINE for BBC; Frank Purves in BARBARA for Carlton TV; Uncle Henry in an episode of DALZIEL AND PASCOE for BBC; 'Hands Across the Sea' playlet in TONIGHT AT 8.30 for the BBC with Joan Collins; WHEN WE ARE MARRIED for the BBC; THE SHILLINGBURY TINKER and THE SHILLINGBURY MIRACLE, from which the series CUFFY developed; title role in DANGEROUS DAVIS - THE LAST DETECTIVE; two series of LANGLEY BOTTOM for Yorkshire TV; HIGH AND DRY for Yorkshire TV.

His appearance as Wilfred Mott in Doctor Who isn't his first association with the series, however; he played police constable Tom Campbell in the Peter Cushing film Daleks' Invasion Earth 2150 A.D..

Cribbins's voice is very well known in numerous BBC radio plays, audio books and commercials, and, of course, as all the voices of THE WOMBLES.

Frederick Treves BEM, born in Margate, Kent was an English character actor with an extensive repertoire, specialising in avuncular military and titled types.

During World War II he served in the Merchant Navy. On his first voyage his ship, the freighter Waimarama, was involved in the Operation Pedestal Convoy toMalta. The Waimarama was sunk on August 13, 1942, and Treves helped save several of his shipmates, including the only ships' officer to survive the sinking, 3rd Wireless Operator John Jackson. Treves, then 17 years old, received the British Empire Medal and the Lloyd's War Medal for his actions. After the War he trained at the Royal Academy of Dramatic Art.

Treves was the great nephew of Frederick Treves, the surgeon who became famous for discovering Joseph Merrick, the "Elephant Man". In the David Lynch filmThe Elephant Man, the surgeon is played by Anthony Hopkins and Treves himself appeared in the character of 'Alderman'.

His over a hundred television credits included roles in The Cazalets, The Jewel in the Crown, A Dance to the Music of Time, The Politician's Wife, To Play the King, Lipstick on Your Collar, Bomber Harris, Trevor Griffiths' version of The Cherry Orchard, David Edgar's Destiny, The Naked Civil Servant and The Railway Children.

Treves also guested in many continuing dramas, such as Rosemary & Thyme, Monarch of the Glen, The Bill, The New Adventures of Black Beauty, Silent Witness, Kavanagh QC, Jeeves and Wooster, Inspector Morse, Agatha Christie's Poirot, Lovejoy, Yes, Prime Minister, Bergerac, Midsomer Murders, Follyfoot,Miss Marple, Minder, Z-Cars, The Avengers, Doomwatch and in the Doctor Who story Meglos.

His films included: Paper Mask, Defence of the Realm, Sunshine, Mad Dogs and Englishmen, Afraid of the Dark, A Flame to the Phoenix, Nighthawks, The Elephant Man and Sweeney 2.

As well as screen appearances, he also had a wide stage and radio career, and appeared with the National Theatre from the late-70s in David Hare's Plenty,Bernard Shaw's The Philanderer, Arnold Wesker's Caritas, Eugene O'Neill's The Iceman Cometh, and two Shakespeares - Leonato in Much Ado About Nothing(1981) and Menenius in Coriolanus (1984).

His eldest son is the actor Simon Treves.

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

Robert Cawdron played Dr. Bruno Taltalian in the Doctor Who serial The Ambassadors of Death.

Also appeared in Days of Hope, The Dick Emery Show, S*P*Y*S, Madhouse, ITV Sunday Night Theatre, The Man Outside, The Persuaders!, From a Bird's Eye View, Zeppelin, Doomwatch, The Private Life of Sherlock Holmes, The Main Chance, Z Cars, Department S, The Six Wives of Henry VIII, Pegasus, The Gold Robbers, The First Lady, Triton, The Blood Beast Terror, The Avengers, The Shuttered Room, The Saint, This Man Craig, The Fighting Prince of Donegal, Dixon of Dock Green, ITV Play of the Week, ITV Sunday Night Drama, The Massingham Affair, Call the Gun Expert, Espionage, Thirty Minute Theatre, The Dickie Henderson Show, No Hiding Place, The Cheaters, BBC Sunday-Night Play, The Amazing Dr. Clitterhouse, Crosstrap, Sir Francis Drake, The Frightened City, Alcoa Presents: One Step Beyond, Saturday Night and Sunday Morning, Danger Man, Man from Interpol, Identity Unknown, Skyport, International Detective, Feet of Clay, Interpol Calling, The Four Just Men, H.G.Wells' Invisible Man, William Tell, Dial 999, The Flying Doctor, Ivanhoe, White Hunter, The New Adventures of Charlie Chan, The One That Got Away, A King in New York, Five on a Treasure Island, Sailor of Fortune, Bonanza!, Assignment Foreign Legion, The Count of Monte Cristo, The Scarlet Pimpernel, Theatre Royal, The Candlelight Murder, The Missing Man, Street of Shadows, BBC Sunday-Night Theatre, Down Among the Z Men, Trent's Last Case, Goonreel, Billy Bunter of Greyfriars School, The Railway Children, Midshipman Barney, Treasure Island, Captain Horatio Hornblower R.N., The Powder MonkeyA Christmas Carol, Highly Dangerous, The Elusive Pimpernel, State Secret, Stage Fright

Brian Langley was Film Cameraman for the 1968 story The Ice Warriors.

Had a long and distinguished career britsih television and films working on over 80 titles.

June Whitfield, CBE was an English actress, well known in the United Kingdom since the 1950s for roles in radio and television comedy series.

Her first big break was a lead role in the radio comedy Take It From Here, and television followed, including appearances with Tony Hancock throughout his television career. In 1966, Whitfield played her first television sitcom role, in Beggar My Neighbour, and this ran for two years. She also starred in several Carry On films.

In 1968, June Whitfield and Terry Scott began their long television partnership which peaked with roles as husband and wife in Happy Ever After (1974-78) and Terry and June (1979-87). Since 1992, Whitfield has appeared in Jennifer Saunders's sitcom Absolutely Fabulous playing Edina Monsoon's mother. In recent years she has played a regular character in Last of the Summer Wine as well as a recurring character in The Green Green Grass.

Bernard Kay was an english actor born in  Bolton, England. He has an extensive theatre, television and film repertoire.

Kay began his working life as a reporter on Bolton Evening News, and a stringer for The Manchester Guardian. He was conscripted in 1946 and started acting in the army. Kay gained a scholarship to study at the Old Vic Theatre School and became a professional in 1950, as a member of the company which reopened the Old Vic after WW2.

He appeared in hundreds of TV productions including Emmerdale Farm, The Champions, The Cellar and The Almond Tree, Clayhanger, A Very British Coup, Casualty, Casualty 1909, Doctors,  Coronation Street and Foyle's War. He also appeared in the very first episode of Z Cars.

He portrayed Captain Stanley Lord of the SS Californian in the BBC dramatisation Trial by Inquiry: Titanic in 1967; and he played the bandit leader Cordova in Zorro television episode Alejandro Rides Again in 1991 which was filmed in Madrid, Spain. Kay also gave a sympathetic performance as Korporal Hartwig in an early episode of Colditz.

His first film appearance was as an injured recruit in Carry on Sergeant, a role which saw him alongside first Doctor William Hartnell. They would work together again in Doctor Who, with Kay appearing in two stories, most notably as Saladin in the classic Doctor Who story The Crusade in 1965 (which also featured Julian Glover and Jean Marsh, and in the second Dalek adventure The Dalek Invasion of Earth (1964); he later worked alongside Patrick Troughton in The Faceless Ones (1967) and Jon Pertwee in Colony In Space (1971). In 2006, he also guest-starred in the Doctor Who audio adventure Night Thoughts.

His most famous film appearance was his turn as a Bolshevik leader in Doctor Zhivago (1965). 

He also acted extensively on the stage. In 1952, for the Nottingham Rep, he learned, rehearsed, and played Macbeth in less than 24 hours. In 1984, he played Shylock in The Merchant of Venice during a British Council tour of Asia, ending in Baghdad, in the middle of the Iraq/Iran war. Other theatre includes An Inspector Calls (Garrick Theatre), Macbeth (Nottingham Playhouse), Titus Andronicus (European Tour), A Man for all Seasons (International Tour), The Merchant of Venice (International Tour), Galileo (Young Vic), Death of a Salesman (Lyric Theatre, Belfast) and Halpern and Johnson (New End Theatre). He has twice appeared at the Finborough Theatre, London - in 2006 in After Haggerty and in 2010 in Dream of the Dog.

Dinsdale Landen was a British actor known mainly for his television appearances.

He played Dr. Judson in the 1989 Doctor Who story The Curse of Fenric.

Landen was born at Margate. He made his television debut in 1959 as Pip in an adaptation of Great Expectations and made his film debut in 1960, with a walk-on part in The League of Gentlemen. He first became well known during the 1960s when he starred in the TV series Mickey Dunne and The Mask of Janus, which was renamed The Spies in later series. He also had a parallel career as a stage actor, including as Richard Dazzle in the RSC's 1970 production of London Assurance.

On radio, he appeared in the 1973 BBC Radio 4 adaptation of The Foundation Trilogy as General Bel Riose, and in the 1976 adaptation of Jim Eldridge's novel Down Payment on Death as Art Gordo. He also portrayed Rupert Purvis in the 1982 production of Tom Stoppard's play The Dog It Was That Died and played the urbane Ambassador McKenzie in four series of Flying the Flag.

In 1977 Landen starred in his own situation comedy, Devenish, playing a Basil Fawlty type character in a Reggie Perrin-type situation; designing board games. In 1980 he starred as Barty in the television series Pig In The Middle with Liza Goddard.

In 1987 he played the lead in a BBC TV production of What the Butler Saw, playing Dr Prentice in a production also featuring Prunella Scales, Timothy West and Bryan Pringle.

Dinsdale Landen died at his home in South Creake, Norfolk on 29 December 2003 after becoming ill with pneumonia. He had been diagnosed with oral cancer several years before his death, but was in remission at the time. He was married to the actress Jennifer Daniel.

Peter Hill played the manager in the 1972 Doctor Who story Day of the Daleks.

Also worked on Crossroads, The Professionals, Dick Turpin, Rings on Their Fingers, In Loving Memory, The Fall and Rise of Reginald Perrin, Target, The Finishing Line, The Cedar Tree, Big Boy Now!, Thriller, Rock Follies, Comedy Premiere, Dixon of Dock Green, A Little Bit of Wisdom, Centre Play, General Hospital, The Hole in the Wall, Softly Softly: Task Force

Robert Lankesheer played the Chamberlain in the 1965 story The Crusade.

Other roles include Full House, Reilly: Ace of Spies, Fawlty Towers, The Professionals, Z Cars, Thriller, Beryl's Lot, Doctor in Charge, Young Winston, That's Your Funeral, Bachelor Father, Junket 89, David Copperfield, Rogues' Gallery, Dad's Army, Dixon of Dock Green, The Avengers, The Scales of Justice, Out of This World, Deadline Midnight, An Arabian Night, Dancers in Mourning, Tales from Dickens, Theatre Royal, Emil and the Detectives, At Your Service, Ltd., The Trial of Andy Fothergill, The Malory Secret