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In page Darkwing Duck:

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Where most prior Disney Afternoon series included at least some preexisting animated characters, Darkwing Duck featured a completely original cast. Even the DuckTales characters it reused had no counterpart in early Disney shorts or the comics. The only exception was the episode "In Like Blunt", which featured cameo appearances by the Beagle Boys, Flintheart Glomgold and Magica De Spell.[5]