Hush (comics) - Wikipedia, the free encyclopedia:
"Hush is a supervillain who appears in comic books published by DC Comics. He was usually an enemy of Batman. Hush first appeared in Batman #609 (January 2003), as part of the 12-issue storyline, Batman: Hush. Hush resurfaced in Batman: Gotham Knights, and later in Detective Comics and Batman: Streets of Gotham."
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