The TARDIS lands on the peaceful planet of Dulkis. There, the Doctor, Jamie and Zoe discover that the ruthless Dominators have arrived and are enslaving the inhabitants with their deadly robots, the Quarks.

The Doctor and his crew must prevent the destruction of the planet and help the Dulcians fight back.

Kate O'Mara was an English film, stage and television actress. 

She was most widely known for her portrayal of strong women such as role as Caress Morell, the sister of Alexis Colby in  Dynasty, The Rani in Doctor Who and Laura Wilde in Howards' Way.

O'Mara made her stage debut in a production of The Merchant of Venice in 1963. Her earliest television appearances included guest roles on Danger Man, Adam Adamant Lives!, The Saint, Z-Cars and The Avengers in the 1960s. In 1970, she appeared in two Hammer Studio horror films; The Vampire Lovers and The Horror of Frankenstein. In 1975, she had a regular role in the BBC drama series The Brothers.

In the early 1980s, O'Mara starred in the BBC soap opera Triangle. In 1985, she was cast as The Rani in the Doctor Who adventure The Mark of the Rani. A  role she reprised in the 1987 story Time and the Rani.

In 1986, she was cast as Caress Morrell in the American primetime soap opera Dynasty. Playing the sister of Alexis Colby (Joan Collins), O'Mara appeared in 17 episodes of the sixth season and 4 episodes of the seventh. She was later cast as another scheming villain, Laura Wilde, in the BBC soap Howards' Way in 1989.

O'Mara continued to make television appearances throughout the 1990s, including Cluedo and Absolutely Fabulous. In 2001, she had a recurring role in the ITV prison drama series Bad Girls before appearing in the short-lived revival of the soap opera Crossroads. 

She also continued to perform on stage and in March 2008 she played Marlene Dietrich in a stage play entitled Lunch with Marlene. From August to November 2008, she played Mrs Cheveley in Oscar Wilde's stage play 'An Ideal Husband' directed by Peter Hall and produced by Bill Kenwright.

Murray Melvin was an English stage and film actor.

The son of Hugh Victor Melvin and Maisie Winifred Driscoll, he was known for having created the role of Geoffrey in the Shelagh Delaney play, A Taste of Honey, which he also performed opposite Rita Tushingham in the 1961 film A Taste of Honey. In 1962 he won Best Actor at the Cannes Film Festival for his performance, and was also nominated for the BAFTA "Most Promising Newcomer" award.

Melvin joined Joan Littlewood's Theatre Workshop company at the Theatre Royal Stratford East while still a student. In 1958, he appeared in productions of Brendan Behan's The Hostage. In 1963, he was in the original cast of Oh, What a Lovely War!.

He appeared in the very first episode of the cult television series The Avengers in 1960. Melvin's other film appearances have included roles in Alfie, and since 1964, regular appearances in the films of director Ken Russell, beginning with Diary of a Nobody and continuing withThe Devils (as the scheming, but ultimately deceived, Father Mignon), The Boy Friend and cameos inLisztomania and Prisoner of Honor. He had an important role as Reverend Samuel Runt in Stanley Kubrick's Barry Lyndon (1975). He also appeared in Crossed Swords (1977) and the Italian mini-series Christopher Columbus (1985).

In 1998 he appeared in a Christmas Special episode of the BBC's Jonathan Creek called "The Black Canary".

In 2004 he appeared as Monsieur Reyer, the musical director and conductor of the Opera Populaire, in the film adaptation of the musical The Phantom of the Opera.

Melvin returned to the Theatre Royal as trustee and archivist and it is partly in this role that he is becoming widely known as a learned and popular film historian - he can be seen and heard, for example, on the BFI DVD release of the Bill Douglas Trilogy.

In 2007 he appeared as the sinister Bilis Manger in the Doctor Who spinoff, Torchwood.

In July 2011 Murray Melvin played The Professor in a short comedy/drama called The Grey Mile, a story about two ex master criminals who are now confined to a care home. The film, written by Jonathan Parramint and Simon Janes, co-stars Paul Shane as Terry 'The Taxman' Tempest and Maggie Tulip as Miss Match. The film was shot on location at Wolterton Hall in Norfolk.

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

Peter Diamond was an English actor who as a regular contributor to Doctor Who in the 1960s, as a fight arranger and actor.

He trained at the Royal Academy of Dramatic Art and his appearances total over 1,000 credits in the industry as a stuntman, co-ordinator or fight arranger.

He appeared as the Tusken Raider who attacked Luke Skywalker in the firstStar Wars Episode IV: A New Hope film. He also contributed to the sequels Star Wars Episode V: The Empire Strikes Back and Star Wars Episode VI: Return of the Jedi.

His film credits include several Carry On films, Never Let Go, From Russia with Love, Dracula: Prince of Darkness, An American Werewolf in London, Raiders of the Lost Ark, and Highlander, where he played the immortal Iman Fasil.

Peter Diamond's numerous TV credits include The Saint, The Avengers, Paul Temple, Last of the Summer Wine, Heartbeat, andLondon's Burning.

He was stunt coordinator/swordmaster on the 1990 TV series Zorro and acted in three episodes, two as Sir Edmund Kendall who taught Diego de la Vega (Zorro) to swordfight, and directed eight episodes. This series was filmed in Madrid, Spain for the U.S. ABC Family channel.

Kathleen Heath was an actress with a large number of credits in British TV Drama. 

Roles include parts in Emma, The Ghost Goes Gear and Break in the Sun.  

Lillias Walker played Sister Lamont in the Doctor Who story Terror of the Zygons.

Also worked on Charlie, The Walls of Jericho, Within These Walls, Beasts, ITV Sunday Night Drama, The Romantic Englishwoman, The Hiding Place, You're on Your Own, Softly Softly: Task Force, Sporting Scenes, Intimate Reflections, Malachi's Cove, Van der Valk, New Scotland Yard, What Became of Jack and Jill?, Public Eye, Manhunt, The Borderers, Paul Temple, The First Churchills, The Wednesday Play, Out of the Unknown, Sir Arthur Conan Doyle, Armchair Theatre, This Man Craig, Mr. Brown Comes Down the Hill

Patrick O'Connell was a retired Irish actor known for numerous performances on UK television and in films.

He was brought up in Birmingham, England and after working in the office of a department store he trained as an actor at RADA. He then appeared in repertory theatre, at the Royal Court Theatre and with the Royal Shakespeare Company.

His television appearances include Fraud Squad as (Detective Inspector Gamble), Dixon of Dock Green, The Brothers (as Edward Hammond), Yes Minister, The Professionals, We'll Meet Again, The Bill, Inspector Morse, Peak Practice, Dangerfield and As Time Goes By.

His film roles include The Shooting Party, The Human Factor, The McKenzie Break (as Sergeant Major Cox) and Cromwell.

He was also an artist known for his paintings and drawings.

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

Colin Eggleston was Film Editor for the 1966 Doctor Who story The Smugglers.

Amongst his work, he was a driving force during the formative stages of Doctor Who in 1963, acting as a caretaker producer prior to the arrival of Verity Lambert. Tucker's friend, the actor and director Hugh David � whom Tucker had actually approached about playing the leading role in the series � later claimed in interviews that it was Tucker who had named the series Doctor Who, although Tucker himself credited Sydney Newman with this. Tucker was also the director originally assigned to the first serial, An Unearthly Child, and later it had been planned that Tucker would direct more of the programme's introductory season. However, these commitments did not work out, and ultimately he directed only The Gunfighters in 1966. During the last episode, The O.K. Corral, a dispute arose between Tucker and then producer Innes Lloyd over the editing of the episode, leading to Tucker requesting that his credit be excised.

The director is played by Andrew Woodall in the 50th Anniversary drama An Adventure In Space And Time.

Donald Bisset was a British actor. 

He played Colin McLaren in the 1966 Doctor Who story The Highlanders.

He also wrote stories for children which he mostly illustrated himself. They have been translated into 16 languages.

He worked on The Bill, The Black Velvet Gown, Campion, One Foot in the Grave, Agatha Christie: Poirot, William Tell, The Hound of the Baskervilles, Little Dorrit, Paradise Postponed, The Return of the Antelope, The Invisible Man, A Pattern of Roses, Only Fools and Horses...., Ragtime, Scarf Jack, Smuggler, The Old Curiosity Shop, Les Miserables, The Professionals, The Thirty Nine Steps, Life of Shakespeare, Warlords of Atlantis, Love for Lydia, Beryl's Lot, Are You Being Served?, Escape from the Dark, The Bawdy Adventures of Tom Jones, Play for Today, The Pallisers, Microbes and Men, The Double Dealers, Pollyanna, Freewheelers, Clinic Exclusive, For the Love of Ada, Nearest and Dearest, Blind Terror, Yak, Doctor in the House, Two a Penny, The Six Wives of Henry VIII, Carry on Again Doctor, Special Branch, Z Cars, The Beverly Hillbillies, The Expert, Mum's Boys, The Troubleshooters, Rocket to the Moon, Eye of the Devil, R3, No Hiding Place, The Saint, Thorndyke, The Indian Tales of Rudyard Kipling, Boyd Q.C., The Hidden Truth, Hide and Seek, Crane, Dr. Finlay's Casebook, Suspense, The Odd Man, Dixon of Dock Green, The Pursuers, Emergency-Ward 10, The Adventures of Robin Hood, On Trial, A Touch of Larceny, The Battle of the Sexes, Friends and Neighbours, The Headless Ghost, Broth of a Boy, Up the Creek, The New Adventures of Martin Kane, Little Red Monkey, The Brain Machine, BBC Sunday-Night Theatre, Murder in the Cathedral, Movie-Go-Round

Michael Mulcaster appeared in a variety of programmes during his career, including The Count of Monte Cristo, The Forsyte Saga, Adam Adamant Lives!, The Power Game, Paul Temple, Doomwatch, Ace of Wands, War and Peace and The Rivals of Sherlock Holmes.

Film roles include the convict Selden in the Hammer version of The Hound of the Baskervilles, and he also appeared in The Curse of Frankenstein and The Revenge of Frankenstein, plus The Flesh and the Fiends and The Brides of Dracula.

Michael Mulcaster was married to Joan Ellacott.