Chain Reaction

The cast and crew of Doctor Who take part in an escape room challenge were they must solve puzzles and escape in under 70 minutes. In this addition Team Third Doctor (Katy Manning, Sadie Miller & Daisy Ashford) attempt to escape the room of doom! Featured as an extra on The Collection Season 7 BluRay boxset.

Since he was a teenager, Dara O Briain has been fascinated with professor Stephen Hawking, the world's most celebrated scientist. In this special film, Dara spends time with his boyhood hero as he attends the world premiere of The Theory of Everything, the movie made about his life, and then at Professor Hawking's home and place of work in Cambridge.

The Missing Years was a documentary containing footage from missing episodes of Doctor Who from William Hartnell's and Patrick Troughton's time as the Doctor. Presented by Frazer Hines and Deborah Watling, it was released on home video by BBC Video in 1998 and contained footage from several episodes.

The cast and crew discussing the transition from Tom Baker to Peter Davison, including exclusive behind-the-scenes footage of the regeneration.

Many incarnations of the Doctors and their old companions are taken out of time and deposited in the Death Zone on Gallifrey. There, they must battle the Master, Daleks, Cybermen and Yeti in order to reach the Dark Tower and discover the Tomb of Rassilon.

A poet's tale of a day in the lives of the villagers of a Welsh fishing town of Llareggub.

The cast and crew of I, Claudius (1976) discuss the making of the series.

Investigative reporter Terry Scanlon follows up the strange goings on in Llanfairfach, with interviews with people there at the time, including Professor Clifford Jones and mysterious boss, Stevens.

By the end of Tom Baker's tenure, the TARDIS crew had grown from the usual one companion to three. This featurette examines the reasons behind this change of direction.

The space solar yacht Tiger Moth under the command of no-nonsense Captain Lisa Deranne is on a cruise taking some rich misfits on a voyage through space. Unfortunately on their travels they have picked a stowaway, a shape-changing Rutan, a race that has been at war with another race, the Sontarans, since the dawn of time. The Rutan has important news regarding the war and the Sontarans, and upon hearing the news, attack the Tiger Moth and take it over. The Rutan hides itself among the crew and one by one the Sontarans and the human crew are murdered by the Rutan. The Sontarans plan to destroy all life on the Tiger Moth. Can Lisa find out who the Rutan is before the Sontarans destroy her ship and her life?...

Retired commander of the United Nations' Intelligence Taskforce, and long-time associate of the mysterious time traveler the Doctor, Brigadier Alistair Lethbridge-Stewart faces the toughest battle of his military career when he is embroiled in a plot unwittingly set in motion by university chancellor Victoria Waterfield, herself a former companion of the Doctor, to take over the Earth by an evil alien entity called the Great Intelligence, aided by its ferocious robot Yeti cohorts. Can the Brigadier defeat this menace to the Earth without the Doctor's help?

Cast and crew discuss the making of The Sea Devils, from the television series Doctor Who.

Even a warrior as brave as Leela knows when it's time to leave the battlefield...

Bringing together key Out of the Unknown actors, directors and production team members for the very first time in order to explore the legacy and impact of the legendary series.

A biography of actor Roger Delgado, featuring previously unseen photographs, rare excerpts from his many BBC TV appearances and interviews with those who knew and loved him.

Blue Peter presenter Yvette Fielding takes Peter Davison, Mark Strickson and Janet Fielding on a trip through BBC Television Centre, meeting up with old friends and colleagues as they reminisce on their time spent working in the iconic building. With film traffic supervisor Neville Withers, assistant floor manager Sue Hedden, costume designer Odile Dicks-Mireaux, production assistant Jane Ashford, make-up artists Joan Stribling and Carolyn Perry, former BBC producer and writer Richard Marson, senior camera supervisor Alec Wheal, exhibitions assistant Bob Richardson and videotape engineer Simon Anthony.