Batman: The Animated Series work together in solving the case of missing valuable cat statues while Batman is away. Some of the other antagonists that appeared in the series included characters such as Poison Ivy, Catwoman, the Riddler, the Mad Hatter, Ra's al Ghul, Talia al Ghul, Man-Bat, the Penguin, the Scarecrow, Killer Croc, Bane, the Ventriloquist and his dummy Scarface, Hugo Strange and Tony Zucco. Other "good guy" characters featured in the show not previously mentioned include Alfred Pennyworth, Harvey Bullock, the Gray Ghost (an original character created by the series to portray Bruce Wayne's childhood hero and crime-fighting inspiration), Lucius Fox and
Batman: The Animated Series as the Mad Hatter, David Warner as Ra's al Ghul, Michael York as Count Vertigo, Kate Mulgrew as Red Claw, George Murdock as and George Dzundza as the Ventriloquist. One of the series' best-known inventions is the Joker's assistant, Harley Quinn, who became so popular that DC Comics later added her to mainstream Batman comic book continuity. The Penguin underwent change for the series; his appearance was remodeled after the version seen in "Batman Returns", which was in production simultaneously with the series' first season. New life was also given to lesser-known characters for the series such as the Clock