The episode was written by David Gerrold, and the original tribble props were designed by Wah Chang and, according to Gerrold, made by Jacqueline Cumeré.
In addition, Chang built the artificial creature in "The Architects of Fear" episode of the original The Outer Limits, some props for the original Planet of the Apes film, the frightening skeleton animated in The Power, the flying machine in The Master of the World, and the dinosaurs in Land of the Lost.
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His other film credits include sculpting the maquette of Pinocchio which was used as the reference for the animators of the classic Walt Disney feature, and articulated deer models for Bambi.
Chang'an | Michael Chang | King Tut's Wah Wah Hut | Jung Chang | Victor Chang | Joseph Chang | Johnson Chang | Chang'an Avenue | Chang | Wah | Tung Wah Group of Hospitals | Sarah Chang | Lee Chang-dong | Jeff Chang | David Chang | Chang'e | Chang Chong-Chen | Yung Ho Chang | Wah Cantonment | University of Wah | P.F. Chang's China Bistro | Iris Chang | Bryant Chang | Young Chang | wah-wah pedal | Wah Do Dem | Wah Chang | Timmy Chang | Terence Chang | P. F. Chang's China Bistro |
The spectacular special visual effects work of Atlantis, the elaborate miniature work of ancient Greek and Roman-style buildings, landscapes, temples, the volcano, the destruction of Atlantis, and the giant crystal ray machine, were the work of the special effects production company Project Unlimited, supervised by Gene Warren, Wah Chang, and Jim Danforth, along with the MGM production staff supervised by A. Arnold Gillespie.