 There are 3 unfinished episodes after Swat Kats episode "Unlikely  Alloys". They are The Curse of Kataluna, Turmoil 2: The Revenge, and  Doctors of Doom. The Curse of Kataluna is also known as Succubus.  All of these 3 unfinished episodes are written by Glenn Leopold. You  can get some informations from Mark Lungos Article of Swat Kats,  which was released on Animato Magazine in 1995. Movie "Scooby doo on  Zombie Island" is based on Swat Kats unfinished episode "The Curse  of Kataluna".