One of the filming models of the fuel tanks from "Protect And Survive" is visible on Jomore's desk.
The interior of the SK90 previously appeared as the interior of the Talon Princess in "The Snake".
The Berkoff radiation is named after famous actor Steven Berkoff, who previously appeared in several episodes of UFO and would go on to appear in this series' "Deadline".
Merlin's Asteroid was actually Merlin's Comet in the script. Similarly, the SK90 vessel was originally written as Prototype 00023.
Original UK Airdates: April 8th 1995 (Sky One); October 16th 1995 (BBC2).
Filming schedule: July 27th to August 5th and August 9th 1994.
David Quilter, Mary Woodvine, Richard James and Megan Olive do not appear in this episode.
Gary Martin is credited as the voice of Slomo even though Slomo does not appear. Martin does however provide the voice of Will Barton.