The TARDIS lands inside a spaceship orbiting the planet Sense-Sphere. The ship's crew are apparently dead but surprise the travellers when they abruptly return to life.

The Doctor has escaped the doomed, parallel Earth and has returned to his own world where he attempts to put a halt to the drilling project.

The Time Lord is prisoner of Kraals, leaving Leela and an unlikely ally to save the day.

Tom Wlaschiha is a German TV, film, stage, and voice actor.

He portrayed Koenig in The Sarah Jane Adventures story Lost in Time.

Born in Dohna, Saxony, Wlaschiha followed his Abitur with acting training at the University of Music and Theatre Leipzig from 1992 to 1996, and attended the Conservatoire pour les Arts Li�ge in 1994.

Since 1998, he has played mostly supporting roles in numerous German and international TV and film productions. His first leading role was that of Stephan in the 2000 gay milieu study No One Sleeps. In August 2011, he was cast as the convict and assassin Jaqen H'ghar in the second season of the HBO fantasy TV series Game of Thrones.

On stage, Wlaschiha has performed with the Theater Junge Generation in Dresden from 1996 to 2000, with the Schauspielhaus Z�rich in 2002 and with the Schauspiel Frankfurt in 2003. As a voice actor, Wlaschiha is heard in film dubs, audiobooks and commercials.

Samantha Spiro is a double Olivier Award-winning English actress.

She is best known for portraying Barbara Windsor in the stage play Cleo, Camping, Emmanuelle and Dick and the television film Cor, Blimey!, DI Vivien Friend in M.I.T.: Murder Investigation Team, and Melessa Tarly in the HBO series Game of Thrones.

In 2001, Spiro was awarded the Olivier Award for Best Actress in a Musical for her performance in the 2000 season Donmar Warehouse production of Merrily We Roll Along. In 2010, Spiro was once again awarded the Olivier Award for Best Actress in a Musical for her performance in Hello, Dolly! at the Open Air Theatre, Regent's Park.

Spiro won a 2004 Joseph Jefferson Award for Actress in a Supporting Role in a Musical, for the production of A Little Night Music at the Chicago Shakespeare Theater in Chicago, Illinois.

In the 2011 British Comedy Awards she won the Best Female Comedy Breakthrough Artist award for her performance in Grandma's House.

Attended the Douglas Webber Academy of Dramatic Arts in London.

Roles included Katy, The Wednesday Play and Jeeves and Wooster.

Paul Bernard was a British television production designer and director, principally active from the mid-1950s to the mid-1970s. 

He was never credited as production designer on Doctor Who, but he directed the plurality of the stories in Seasons 9 and 10. These included the first colour appearance of the Daleks and what was to be Roger Delgado's final appearance as the Master. His work on Doctor Who was amongst the last work he did for television. He left for a new career in fine arts in the mid-1970s.

_{Biography from the TARDIS wiki article, licensed under CC-BY-SA}

Ralph Watson (born 1936) has worked extensively in theatre, television and film for over fifty years .

In the '60s and '70s he appeared in four Doctor Who serials alongside three Doctors, working with Patrick Troughton twice. He played Generator Scientist in The Underwater Menace, Captain Knight in The Web of Fear, Ettis in The Monster of Peladon and Ben in Horror of Fang Rock.

In 2009 he returned to the BBC to record the audio commentary for the Doctor Who DVD Box Set "Peladon Tales" where he was reunited with fellow cast members Donald Gee and Nina Thomas, as well as Producer Barry Letts and Script Editor Terrance Dicks.

Biography from the Tardis Wiki article, licensed under CC-BY-SA

Philip Latham  is a British actor. 

He was educated at Felsted School.

In the late 1960s/early 1970s he was well known to British TV viewers for his portrayal of chief accountant Willy Izard, the "conscience" to hard-nosed oil company industrialist Brian Stead (played by Geoffrey Keen) in the BBC series The Troubleshooters (1965–72). Other credits The Cedar Tree, The Saint, Maigret, Sergeant Cork, Justice, Love Story, Killers, Hammer House of Horror, No. 10, Nanny and The Professionals.

One of his most famous film roles was as Dracula's sinister servant Klove in Hammer's 1966 film Dracula, Prince of Darkness. On television he played Plantagenet Palliser in the multipart series The Pallisers. He also played Lord President Borusa in the 1983 20th anniversary episode of Doctor Who, The Five Doctors.