Being the central antagonist means that while you're not the main antagonist you are the one who drives most of the plot and are the most "in your face" antagonist towards the protagonists. For example Darth Vader was the central antagonist of the original Star Wars trilogy with The Emperor being the actual main antagonist.
Who is the secondary antagonist is it Ultraman or Superwoman, Ultraman is the leader of the Crime Syndicate and was planning to threaten the world with the QED bomb while Superwoman was helping Owlman with his bigger plan and had a boyfriend and girlfriend relationship
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