There's not much known about this unused premise other than one of Dr. Viper's mutagens backfires and turns Felina into a "vampire she-kat". Despite Viper's intention, she rebels on everyone until the Swat Kats and Dr. Konway get her back to normal.
According to Lance Falk, one of Hanna Barbera's writers, in this unused premise, a power failure is just the start of the problems on Megakat City, specially when a new villain called Blackout threatens to destroy the city.
According to Lance Falk, one of Hanna Barbera's writers, in this unused premise, Rex Shard (who appeared in Chaos in Crystal) was supposed to return, now as a mutant weather warrior looking to freeze Megakat City.
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