One of the rare episodes with an abrupt ending, which doesn't show Jim West nor his sidekick Arte.
One of the only episodes where there is no scene aboard the headquarters train.
The place where Dimas holds West and Naomi Buckley in the round cage is the same place Dr. Articulus used as his laboratory in The Night of the Undead (1968).
Dabbs Greer had previously worked with Robert Conrad on his earlier series Hawaiian Eye in the episode "Thomas Jefferson Chu" (1961).