All of the preproduction works were finished for 3 unfinished episodes (The Curse of Kataluna, Turmoil 2: The Revenge, and Doctors of Doom) when SWAT Kats got canceled. These 3 unfinished episodes were written by Glenn Leopold (Story Editor/Writer of SWAT Kats). According to Writer Mark Lungo (who wrote the Animato Magazine Article for behind the scenes of SWAT Kats), Thundertruck that was used in the episode "When Strikes Mutilor" was recreated in the unfinished episode "The Curse of Kataluna" to destroy the villain "Kataluna."