Cesar Romero portrayed The Joker in the 1960s Batman series and the 1966 film. He tied with Burgess Meredith's Penguin for the most frequent appearances of a villain on the series.
Characters portrayed by Cesar Romero in the Batman Universe
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Famously, rather than shaving his mustache for his role as Joker he simply painted over it.
He was known as "The Latin Lover".