Ian and Vrestin fall into caverns beneath the surface of Vortis and encounter the Optera. The Doctor finds the landing site of the Menoptra, and the Zarbi prepare to ambush them.

The Keller Machine breaks free of the Doctor's restraining device and the Doctor has no choice but to turn the parasite against the Master.

The Doctor, Sarah and Scorby are hunted down by the mad Harrison Chase. Outside the Krynoid prepares to germinate, sending its deadly seed pods out across the world.

Rufus Hound is an English comedian, actor and presenter.

He is known for his work on Argumental (2008), The BRITs 2009 Red Carpet (2009) and Isle of Wight Festival 2010: Live (2010). 

Julian Simpson is a London-based writer and director working in film, TV and radio. He was educated at Felsted School.

His credits include The Criminal, Superstorm, Murder Prevention, Spooks, New Tricks, Hustle 

Extra in The Space Museum and several other Doctor Who sotries

Also known as David Cleeve

Works include Then Churchill Said to Me, Two People, Bless Me Father, Affairs of the Heart, Microbes and Men, Upstairs, Downstairs, Z Cars

Jonathan Newth is a British actor, best known for his performances in television.

He appeared in the 1978 story Underworld.

Credits include: Emergency Ward 10, The Six Wives of Henry VIII, Ace of Wands, The Troubleshooters, Z-Cars, Callan, Van der Valk, The Brothers, Softly, Softly, Poldark, Notorious Woman, Secret Army (Barsacq), The Professionals, The Nightmare Man, The Day of the Triffids, Tenko (Colonel Clifford Jefferson), Triangle, Angels, Juliet Bravo, After Henry, Boon, Bugs, The Bill, Agatha Christie's Poirot (Dumb Witness), Peak Practice and Heartbeat.

Born in Luton in 1931, David Webb was an achiever in his early life, becoming best boy at Luton Grammar School and later a sergeant in the Army Education Corps, and then gaining a scholarship to the Royal Academy of Dramatic Arts. During his career he appeared in hundreds of television programmes, which as well as Leeson in Doctor Who also included a prominent role in the early days of Coronation Street - his prolific work earned him the title "Telly Tart"!

His career also encompassed films, such as The Battle of Britain, and he also served on the Equity Council. As well as being an actor, he was a major campaigner against censorship, being a founder and director of the National Campaign for the Reform of the Obscene Publications Acts. 

His CV included: Rescue Special Ops, Rake, Griff the Invisible, Packed to the Rafters, Out of the Blue, Chandon Pictures, Katoomba, The Starter Wife, Road Rage, Clubland, Superman Returns, Small Claims: The Reunion, Untold Stories of the ER, Home and Away, Rosemary & Thyme, The Junction Boys, Always Greener, The Diamond of Jeru, Stingers, All Saints, Airtight, First Daughter, Silent Predators, Berkeley Square, Murder Call, A Dance to the Music of Time, Heart of Fire, Rebecca, Water Rats, The Beast, Twisted, Frisk, Babe, G.P., Blue Heelers, Lethal Ninja, Police Rescue, Candid Camera on Australia, Terminal Exposure, Double Sculls, The Black Tower, Minder, The Road to 1984, Tales of the Unexpected, Bergerac, Rain on the Roof, Crime and Punishment, ITV Playhouse, Blakes 7, Z Cars, Rumpole of the Bailey, Pennies from Heaven, Rogue Male, Not on Your Nellie, Crown Court, The Rivals of Sherlock Holmes, Doctor at Large, Where Dead Men Lie, Play for Today, Battle of Britain, The Avengers, Private Investigator

Obituary: Digital Journal, Libertarian Alliance

Glyn Owen  was a British stage, television and film actor.

He was best known to British TV viewers for two roles: that of Dr Patrick O'Meara in the long-running ITV hospital drama Emergency - Ward 10, and that of Jack Rolfe, the headstrong director of the Mermaid Boatyard in the mid-1980s BBC series Howards' Way.

His other television roles included Coronation Street, The Brothers, Doomwatch, The Adventures of William Tell, The Rat Catchers, All Creatures Great and Small, "Take The High Road", The Capone Investment, Ennal's Point, Oil Strike North, Survivors, and Blake's 7. 

John Rees played Hardy in the 1973 Doctor Who story Frontier in Space.

Works include Saracen, The Bill, White Mischief, Sky Bandits, Defence of the Realm, Plenty, Lorca and the Outlaws, The Citadel, The Sender, Eye of the Needle, Raiders of the Lost Ark, Juliet Bravo, Tales of the Unexpected, Hanover Street, Secret Army, The Shout, Holocaust, A Sharp Intake of Breath, The Wilde Alliance, Lord Tramp, The Hanged Man, All Creatures Great and Small, The Venturers, Visa für Ocantros, Crown Court, Fall of Eagles, Out of the Past, Centre Play, The Black Arrow, The Brontes of Haworth, New Scotland Yard, Van der Valk, Budgie, Love Story, Under Milk Wood, A Family at War, Play for Today, Z Cars, The Go-Between, The Mating Machine, W. Somerset Maugham, The Wednesday Play, Strange Report, ITV Sunday Night Theatre, Alfred the Great, ITV Playhouse, Softly Softly, Theatre 625, The Prisoner, The Ragged Trousered Philanthropists, The Troubleshooters, The Quiller Memorandum, ITV Play of the Week, The Spies, Four Soldiers, Moulded in Earth, The Man in Room 17, R3, No Hiding Place, The Saint, It's a Woman's World, The Villains, Lucy und der Angler von Paris, Suspense, Maupassant, The Story of Private Pooley, Impact, A Prize of Arms, Only Two Can Play, The Terrorists, The Long and the Short and the Tall, A Farthing Damages

Kenneth Ives is a British actor and director with a number of 1960s and 1970s television credits.

He played Toba in the 1968 story The Dominators.

He appeared in the 1968 film version of The Lion in Winter, the 1971 BBC serial The Last of the Mohicans as Hawkeye, and had roles in Adam Adamant Lives!

He later became a director, with credits for a production of The Birthday Party as well as episodes of Poldark, Gangsters, Softly, Softly: Taskforce, All Creatures Great and Small and Secret Army.

David Bailie played Dask in the Doctor Who story The Robots of Death and later played the Celestial Toymaker in the Big Finish Productions' audios.

He was born in South Africa, going to boarding school in Swaziland and emigrating to Rhodesia (now Zimbabwe) with his family in 1952.

His first acting experience soon after school in 1955, was an amateur production of 'Doctor in the House' which persuaded him he wanted to be an actor. After leaving school he worked in a bank and then for Central African Airlines. In 1958, he made his first trip from Rhodesia to England to get a lie of the land.

In 1960 he moved to England and landed his first small role in the film Flame in the Streets (1960) and then played on of the bells boys in Arthur Koppits "Oh Dad Poor Dad Mama's hung you in the Closet and I'm feeling so Sad" (1961) with Stella Adler playing Madame Rosepettle.

He was accepted by Laurence Olivier joining the National Theatre. He played minor roles and also understudied Sir Laurence Olivier in Love for Love.

Terry Hands invited Bailie to join them as an associate artist (1965). There he portrayed i.a. Florizel opposite Dame Judi Dench's Perdita in 'A Winter's Tale' along with Valentine in Two Gentlemen of Verona, the Bastard in King John, Kozanka in The Plebeians Rehearse the Uprising and Leslie in The Madness of Lady Bright.

During the early 1970s he worked with Stomu Yamashta at his Red Buddha Theatre. He was cast as the lead in a show called 'Raindog', requiring him to do everything from singing (writing his own songs) and dancing, to performing Martial Arts and gymnastics - which he frankly admits was a demand too far and when Yamashta offered him a paltry sum for performing the opportunity was there to depart which he did.

Between 1980 and 1989 he ran a furniture-making business. In 1990 he closed that down and returned to acting, having in fact to virtually restart his career. It didn't help that at exactly this point he had to have a cancer removed from his lip which required learning to speak again.

In the mid 1990s after playing alongside Brian Glover in Canterbury Tales he made a comeback in the movie business as 'Skewer' in Cutthroat Island (1995), then played an English Judge in The Messenger: The Story of Joan of Arc (1999), and also the engineer in Gladiator (2000).

Bailie's best known work in film is the role of Cotton, a speechless pirate who has his tongue cut out, so he miraculously trained his parrot, also named Cotton, to read his mind and speak on his behalf. Bailie first appears as Cotton in Pirates of the Caribbean: The Curse of the Black Pearl (2003) as one of the pirates Jack Sparrow chooses in Tortuga. He is one of the Black Pearl crew-members to survive the Kracken attack in the sequel Pirates of the Caribbean: Dead Man's Chest (2006). Bailie is also plays Cotton in the third installment of 'Pirates' Pirates of the Caribbean: At Worlds End (2007).

David Bailie also emerged as a radio actor. He played the mad scientist Taren Capel, a re-incarnation of his earlier work from the 60s cult series 'Doctor Who'. He has recently been involved in two audio DVDs playing the memorable character of the 'Celestial Toymaker' from Dr Who.

He now also works as a Professional Photographer! Portraiture and Landscapes being his speciality. He travels nowhere unless his destination offers good Photo opportunities.

Donald Wilson was a British television writer and producer, best known for his work on the BBC's adaptation of The Forsyte Saga in 1967.

It was Wilson who, as head on the BBC Script Department, commissioned the report that lead to the creation of Doctor Who.

His initial career was in the film industry, working for MGM at Elstree Studios, where he was Assistant Director of such films as Jericho (1937) and Goodbye, Mr. Chips (1939). During the war he worked on documentary films, and then in 1955 was recruited to BBC Television by the then Head of Drama, Michael Barry.

When the Script Department was rendered redundant by Sydney Newman�s radical shake-up of the BBC Drama Department after his arrival as its head in 1962, the highly respected Wilson was given one of the most senior positions under Newman as Head of Serials. In this position, Wilson was responsible for overseeing the creation and development of  Doctor Who. It was Wilson, together with Newman and staff writer C. E. Webber, who co-wrote the first format document for the programme.

In 1965, Wilson gave up his position as Head of Serials to concentrate on realising a long-held ambition of bringing The Forsyte Saga to the screen. Acting as both adapter and producer, Wilson created one of the BBC�s most popular and successful drama serials of all time, which was a huge hit on its eventual screening on BBC Two in 1967, and was quickly repeated on BBC One. Later, he acted as adapter and producer again on such prestigious costume dramas as The First Churchills (1969) and Anna Karenina (1977).

He went on to work for Anglia Television before retiring to his home in Gloucestershire, where he died at the age of 91 in March 2002.

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

Actor who played Barney in the 1967 story The Macra Terror

Alan Haywood played Hector in the 1965 Doctor Who serial The Myth Makers.

Also worked on Jemima Shore Investigates, On the Razzle, BBC2 Playhouse, The Strange Affair of Adelaide Harris, Colditz, UFO, Crossplot, Zeta One, Z Cars, The Saint, Dixon of Dock Green, Out of the Unknown, Reluctant Bandit, Crossroads, Smuggler's Bay, Espionage, Richard the Lionheart, The Avengers, No Hiding Place, ITV Play of the Week, Doomsday at Eleven, Fortune's Fools, Cash on Demand, The Spanish Sword, Barnaby Rudge, The Long Way Home, BBC Sunday-Night Play, Emergency-Ward 10, The School for Scandal, The Merry Wives of Windsor