Video : UK release 1995, US release by CBS/Fox Video

Books : Novelised 1979 by Ian Marter (0-426-20092-6).

Working Titles: The Galactic Con Man, The Ribos File, Operation

Notes: This story introduces the Key to Time quest that is continued through the season
John Leeson's K-9 voice is not heard in Part Two
The organ music heard in the story was played by Leslie Pearson