The yellow formation of lights used to represent the "Heart of Kalthon" was the same special effects shot used as the source of the firestorm on Catacombs of the Moon (1976)".
Makes the final use of the cave set, originally seen on The Metamorph (1976). It was also used on The Exiles (1976), Journey to Where (1976), One Moment of Humanity (1976), All That Glisters (1976), New Adam New Eve (1976), The Mark of Archanon (1976), The AB Chrysalis (1976), and Catacombs of the Moon (1976).
Right before Sandra (or "Sahn") reports the details of how Alpha is "dying", the sound effects of the computer being programmed to divert the massive surge of power to the asteroid (at 46:00) are used heavily in the movie Alien (1979).
This episode marks the third mention of a Black Sun (after Dragon's Domain (1975) and Black Sun (1975)).
James Leith (security guard) was the son of Margaret Inglis, who was featured on The Exiles (1976) as Mirella.