Step 1 : Introduction to the question "Who played the Joker in the original "Batman" TV series in the 1960s?"
...Many in Hollywood questioned the wisdom of leading man Cesar Romero taking the role of "The Joker" in the 1966 TV series "Batman." The role, for which he refused to shave his trademark mustache, was a favorite part of the hugely successful TV series. Romero's first movie role was in 1933 and he rapidly rose through the ranks as a "Latin lover." He gave memorable performances in 1947's "Captain from Castile" and in 1948's "Julia Misbehaves." These roles helped him land a starring role in 1954's TV espionage serial "Passport to Danger." Because of a brilliant profit-sharing arrangement on which he insisted, Romero made a considerable income from this venture. Though he had no financial need to work again, he continued taking roles, much to the delight of his fans, for years to come. Source: IMDb.com