Paul Darrow and Lesley Judd's trip to Arg with guest Robert Malos was wiped from the BBC archives. However, a domestic, off-air recording was obtained in order to bring their adventure to the DVD release.
Elizabeth Estensen and Fred Harris are the first space travellers to visit Arg, along with member of the public Mark Dugdale. Can they collect the crystals needed to return home, when they're being "helped" by the Argonds?
In arguably the most bizarre episode, Chris Serle attempts to please Uncle by singing him a ballad, accompanied by the Argestra. Will his song win favour, or will Sandra Dickinson and Adam Tandy have to carry on without him?
The second series has some new elements, with creator Patrick Dowling greeting the contestants on Earth before they travel to Arg. There's also Lesley Judd, who has remained on Arg as a mole, and, most famously of all, the Vortex.
With the Rubik's Cube craze of the time, Cube expert David Singmaster enters as a celebrity, alongside Nationwide presenter Sue Cook. Joining them on their trip to Arg is marketing executive Philip Sheppard.
Janet Fielding, judo champion Neil Adams and antiques dealer Nigel Crockett face the challenges of Arg in a week where Uncle is in a particularly bad mood. Will Uncle's unorthodox Vortex strategy work, or cause him further anger?
Actress Denise Coffey and Sky at Night presenter Dr. Garry Hunt are joined by Toby Freeman on their trip to Arg. But while Toby was the non-celebrity for the week, he went on to be a games consultant on the series.
A dramatic finale as Captain Acteon of the Cosmic Investigation Department visits Arg to arrest Lesley Judd for being a mole. Contestants John Craven, Kirsty Miller and Bill Green must quickly exit to avoid the mayhem.
"Stopwatch" presenter Paul McDowell joins Bonnie Langford and Mastermind finalist Christopher Hughes in a series of increasingly bizarre puzzles and outlandish situations.