General Hermack suspects Milo Clancey of being in league with the pirates. Trapped inside a segment of the beacon, the air supply is running out for the Doctor, Jamie and Zoe.

The Doctor finds that some of Davros's fellow Kaleds are unhappy with the development of the Daleks. Sarah is forced to load a Thal war rocket with radioactive explosives.

Sean Biggerstaff  is a Scottish actor who has had roles in several Big Finish plays, including: Chris Parsons in the Webcast of  Shada, Snabb in The Skull of Sobek and the Ruhk in  Time Reef. 

Outside of his Doctor Who work, Biggerstaff is known for his recurring role as Oliver Wood in theHarry Potter films.

Curtis Rivers is a British stuntman, stunt coordinator, author, inspirational speaker, and World Record holder.

Stunts

Rivers has performed stunts in films such as James Bond, Fury (2014 film), Thor: The Dark World, Captain America: The First Avenger, Snow White and the Huntsman, Sherlock Holmes: A Game of Shadows, Robin Hood (2010 film), Prince of Persia: The Sands of Time (film), The Wolfman (2010 film), St Trinian's (film) / St Trinian's 2: The Legend of Fritton's Gold, National Treasure: Book of Secrets and The Da Vinci Code.

In movies, Rivers has been a stunt double for Christopher Lee, James Caviezel, Rupert Everett, Mark Strong, Hugo Weaving, Jim Broadbent, Matthew MacFadyen, Patrick Bergin, Martin Kemp, Jimmy Nail, Graham McTavish, and Sam Douglas.

In television, he has been a stunt double for Martin Clunes, Trevor Eve, Stephen Tompkinson, Malcolm Sinclair, James Purefoy, Charlie Cox, Tim Dutton, Nick Brimble, Peter Marinker, and Mark Charnock.

He also doubled for John Barrowman for the first 3 seasons of Torchwood, as well as in Doctor Who, falling backwards 140 ft from the British Gas Building in Cardiff for the first episode of Season 2 - Kiss Kiss, Bang Bang (Torchwood).

As well as working as a stunt coordinator, Rivers also works as a Second Unit Director.

Writing

He is the author of Seven Paths to Freedom, a semi-autobiographical self-help book, written to create a positive mindset in its readers. His book has five star reviews.

Rivers also works as a motivational speaker, drawing on experiences in the film and TV industries, his book Seven Paths to Freedom, and his Guinness World Records.

In 2002, he broke world records in parachuting (Longest Parachute Jump) and bungee jumping (Highest Bungee Jump). Both world records required special thermal clothing to cope with the severe sub-zero temperatures at such altitudes.

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

Tony Osoba (born  in Maryhill, Glasgow, Scotland) is a Scottish actor best known for his role as Jim 'Jock' McClaren in the popular 70s British sitcom Porridge, and appeared in its sequel Going Straight. Osoba was the first black Scottish actor to appear on primetime television when he appeared in the series.

He had an early ambition to design cars but when he realised that the employment opportunites in that field were limited he decided to become an actor after his A-levels and trained at the Royal Scottish Academy of Music and Drama. He then joined a theatre company in Richmond, toured abroad and was a member of the Royal Shakespeare Company.

His other television roles include Det. Sgt. Charles 'Chas' Jarvis in Dempsey & Makepeace (1984-6) and Peter Ingram in Coronation Street (1990). He has also appeared in Space: 1999 (1976), The Professionals (1978), Charles Endell Esq (1979), The Flame Trees of Thika (1981), Bergerac (1983), Between the Lines (1994) and Dinotopia (2002) as well as two appearances in Doctor Who in the stories Destiny of the Daleks (1979) and Dragonfire (1987).

In 2005, Osoba starred as the Kralahome in a UK touring production of the The King and I.^[6] Recent credits include the 2007 film Tanner, as Superintendent Smith in Hollyoaks and Charlie Dokes in The Bill. In 2011 Osoba made a brief appearance in an episode of The Shadow Line.^[7]

Osoba has also appeared in one radio series, Space Force (1984�1985), as Loderick Sincere.

James Ellis was an actor and stage director with a career stretching over sixty year.

He played Peter Warmsly in the 1989 story Battlefield. 

Ellis was best know for playing Bert Lynch in Z Cars. Other roles included parts in  Randy Dandy, Billy, In Sickness and in Health, Ballykissangel, Playing the Field, One By One, the cult sitcom Nightingales, with Robert Lindsay and David Threlfall. 

In Antonia Bird's Priest (1994), from a screenplay byJimmy McGovern, he played Father Ellerton. Ellis has also contributed cameos to popular series such as Boys from the Blackstuff by Alan Bleasdale, Only Fools and Horses, The Bill, Casualty, Birds of a Feather, Lovejoy, Boon andCommon as Muck.

Mervyn Haisman was a television and film script writer.

He also worked as an actor and managed a theatre.

An early television credit was an episode of Doctor Finlay�s Casebook (1967) called The Forgotten Enemy. At about the same time he formed a writing partnership with Henry Lincoln, and together they were the authors of three Doctor Who stories. Together they created the Yeti and the Quarks.

Haisman also wrote for many British television shows including The Onedin Line (on which he also worked as script editor), Howards' Way, and Swallows and Amazons Forever!; and on the horror movie Curse of the Crimson Altar, also known as The Crimson Cult (1968), again with Henry Lincoln.

He provided script for the popular BBC series Jane (1982) , starring Glynis Barber as the wartime comic strip pin up. He was to also write the second series Jane in the Desert (1984). The success of the TV series lead to Haisman writing for the movie Jane and the Lost City (1987). This time featuring Kirsten Hughes in the lead role.