|Voiced by:||Rob Clotworthy|
Billy was a security guard at the Tarnower Financial.
Billy found himself being fooled by Clayface on several occasions. First, the shapeshifter assumed the form of his partner; later, that of his boss. When Billy remarked that Mr. Tarnower had lost his accent, Clayface revealed himself, and knocked Billy unconscious. He then used Billy's form to escape the Batman, but the Dark Knight saw through the disguise.