Twenty years before superhero movies dominated pop culture, director Tim Burton made a breakthrough with his 1989 Batman movie. The dark adaptation became the most domestically successful American film that year, thanks in no small part to the celebrity firepower it brought to bear. Michael Keaton starred as the Dark Knight, Jack Nicholson played the Joker, and Prince performed the soundtrack. Now, a new comic series released by DC Comics this week based on the 1989 film features a small cameo from the Purple One.