The Doctor activates an emergency unit on board the TARDIS to escape destruction by a volcanic eruption.

Unfortunately, it moves them out of normal space and time to a deadly world where fantasy rules. The travelers find themselves lured out of the ship into a ghostly white void.

James Weber Brown was born in Cuckfield, West Sussex, England. He is an actor, known for The Oxford Murders (2008), Fast Freddie, the Widow and Me (2011) and Tower Block (2012).

Niall Greig Fulton played Gideon Vandaleur in the Doctor Who story The Wedding of River Song.

Other roles include parts in Taggart, Legacy: Black Ops, Casualty, Crying with Laughter, The Princess and the Gangster, Dark Nature, Holby City, Wedding Belles, EastEnders, Timewatch, Nowhere, No One, The Outsider, The Flying Scotsman, Zoltan the Great, The Mermaid, Im, One Last Chance, The Host, Cry for Bobo, Stacey Stone, Marcie's Dowry, Best Man, The Acid House, Fake, To Whom It May Concern

Gary Powell played Devreld Ashton in the 2007 Doctor Who story 42.

Also worked on New Tricks, Law & Order: UK, Holby City, Another Year, The Bill, Five Days, The Golden Hour, Judge John Deed, Tom Brown's Schooldays, Fallen, A Touch of Frost, Helen West, The Many Lives of Albert Walker, From Hell, Beech Is Back, Crush, Lock, Stock..., Kavanagh QC, Sharman, Thief Takers, Inspector Morse, She's Out, Between the Lines, Minder, EastEnders, The Widowmaker, Rules of Engagement

Gary Cady is a British actor. 

He played Luke Ward in the 1985 Doctor Who television story The Mark of the Rani.

He has appeared in the television series Brass (1983), Fairly Secret Army (1984) Leaving (1984), as well as a number of TV miniseries.

Zienia Merton is a British actress born in Burma. 

Her mother was Burmese, and her father half-English, half-French. She was raised in Singapore, Borneo,Portugal, and England. She is probably best known for playing Sandra Benes in Space: 1999.

She played Ping-Cho in the 1964 Doctor Who serial Marco Polo and the Registrar in 2009 The Sarah Jane Adventures story The Wedding of Sarah Jane Smith. 

Other early television appearances included Strange Report (1968), The Six Wives of Henry VIII (1970) and Jason King (1971). She was a lead actress as Christina in the Dennis Potter TV adaptation of Casanova with Frank Finlay, and appeared on The Benny Hill Show in 1972, playing the wife of Hill's Chow Mein character. Zienia Merton also featured as Ting Ling in the film The Chairman (1969) with Gregory Peck.

Probably her most memorable role is that of Sandra Benes in Space: 1999, the science fiction series produced by Gerry Anderson and Sylvia Anderson between 1973 and 1976, with Martin Landau, Barbara Bain, Barry Morse andCatherine Schell. In 1999 Merton reprised this role in the professionally produced short film Message from Moonbase Alpha, written by series writer Johnny Byrne. This short episode surprised everyone on its debut at the closing ceremony of the Breakaway 1999 convention in Los Angeles, California on September 13, 1999 - the date on which the moon is blasted out of Earth orbit in the pilot episode of the original series. Regarded by many fans as the 49th and final episode, and providing a closure to the series, "Message from Moonbase Alpha" is included as a special feature on the "UFO and Space: 1999 Documentaries" DVD, available exclusively from Fanderson.

Following Space: 1999, Merton appeared in many popular television series including Grange Hill, Return of the Saint (1979), Bergerac (1983), Angels (1983), Tenko (1984), Dempsey & Makepeace (1985), Lovejoy (1986), Crime Traveller(1997), Doctors (2001), Dinotopia (2002), Casualty (1986 � 2002), EastEnders (1998 � 2003), The Bill (1999 � 2005), Judge John Deed (2006), Coronation Street (2008) and Wire in the Blood (2008). Merton re-joined fellow Space: 1999star Ian McShane for the 1986 Lovejoy episode "The Axeman Cometh".

In December 2008, Zienia Merton filmed a guest role for the eighth episode ("Samaritan") of the ITV drama Law & Order: UK. Although the series premiered on 23 February 2009, some episodes were held over for broadcast as "Series Two". "Samaritan" was first transmitted on ITV1 on 11 January 2010.

Duncan Brown provided the Studio Lighting for several Fourth Doctor Doctor Who stories.

Also worked on Oh Doctor Beeching!, Charles Santore Illustrates The Wizard of Oz, The Legacy of Reginald Perrin, Death of a Salesman, Which Way to the War, Absolutely Fabulous, The All New Alexei Sayle Show, The Late Show, Watchdog, You Rang, M'Lord?, Mulberry, May to December, Allo 'Allo!, A Bit of Fry and Laurie, Bread, EastEnders, Hi-de-Hi!, Just Good Friends, The Crystal Cube, Maybury, Are You Being Served?, Fair Ground!, Objects of Affection, The Young Ones, BBC2 Playhouse, Play for Today, It Ain't Half Hot Mum, Yes Minister, Face the Music, Pinocchio, The Songwriters, The Duchess of Duke Street, Ripping Yarns, Madame Bovary

Robert Demeger trained at the Central School of Speech and Drama. In theatre he appeared in several roles for the Kick Theatre under Warner, including King Lear in the 1985 adaptation at the Almeida Theatre and later in Jew of Malta at the same venue, as well as several roles in productions with the Royal Shakespeare Theatre. He also appeared three times in The Woman in Black, and played Neville Chamberlain in Three Days in May.

In television he had roles in a number of crime dramas, including Inspector Morse, Wycliffe, The Bill and even The Thin Blue Line. Other roles included Einstein in Dark Matters, Malcolm Lyon in The Hour, and his appearance in Doctor Who as The Preacher in The Shakespeare Code.
Films he appeared in included Wuthering Heights, Orlando and The Young Poisoner's Handbook.

Diagnosed with brain cancer, Demeger undertook a revolutionary form of immune therapy from the United States, becoming the first European patient to do so; however, treatment was found not to work in his case.

Angus Lennie is a Scottish actor best known for his film appearance as Steve McQueen's friend Archibald Ives in the 1963 film The Great Escape. 

He appeared in the Doctor Who stories The Ice Warriors and Terror of the Zygons.

He was also known for being in the television soap opera Crossroads.

Other TV credits include: The Saint, The Borderers, Z Cars, Rumpole of the Bailey, Lovejoy, The Onedin Line, All Night Long, Keeping Up Appearances and Monarch of the Glen.

His film appearances include: 633 Squadron, Tunes of Glory, Oh! What a Lovely War and a significant role in The Great Escape as the diminutive serial escaper Flying Officer Archibald Ives (nicknamed The Mole).

He has appeared in many stage productions including A Midsummer Night's Dream and pantomimes.