David Troughton is the son of Patrick Troughton. He had previously appeared as Private Moor in The War Games: Episode Four (1969), and he would appear in Midnight (2008).
Alpha Centauri's phallic resemblance was not lost on the crew. Costume designer Barbara Lane elected to outfit Centauri in a yellow cloak to mask the body shape.
This episode takes place on Peladon in 3885.
Aggedor was conceived as being ape-like. The finished costume was more ursine in appearance.