Batman and Son Tim Drake was Robin. In that year, the miniseries "Infinite Crisis" was released. The series was a crossover event of all of the characters of the DC Universe, and had universe-changing consequences. At the end of the series, Batman decides that he needs to focus on keeping his family safe and close, so leaves Gotham City with Nightwing, Robin, and his butler Alfred Pennyworth for a year. After his return, he adopts Tim Drake, formally making him his son. Batman also had many interactions with the al Ghul family through the years. Early in their interactions it was established that
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