The TARDIS, along with the Doctor, Leela and K-9, arrives on Pluto in the distant future. The time travellers discover the planet has a breathable atmosphere and enjoys heat from six small suns, but the humans who live there are taxed and exploited heavily for the privilege. When Leela is captured and sentenced to death, the Doctor must save his companion, as well as stopping the ruthless Company, before it is too late...
Commentary by actors Tom Baker (the Doctor), Louise Jameson (Leela) and Michael Keating (Goudry), and director Pennant Roberts
Running from the Tax Man A retrospective look at the making of the story and the science behind it. With Louise Jameson, Michael Keating, Pennant Roberts, writer and historian Dominic Sandbrook and astronomer MarekKukula
The Doctor's Composer - Part Two The concluding part of our look at the career of prolific composer Dudley Simpson, covering his work on the show in the 1970s