This is the only fourth season episode to feature Mutoids, last seen in Moloch (1980), who now have gold wigs rather than the tight helmets seen before.
Several of the actors playing the animals had to be treated in a nearby hospital for facial burns, caused by a severe reaction to the spirit gum and latex masks used for the costumes.
Kevin Stoney who plays Ardus had previously appeared as Councillor Joban in the season 2 episode Hostage (1979).