Her association with DC Comics extended to television where she served as composer for Batman: The Animated Series (1992–1995), Superman: The Animated Series (1996–2000), The New Batman Adventures (1997–1999), and Batman Beyond (1999–2000); setting a standard for the musical tone of the DC Animated Universe.
Batman | Alice's Adventures in Wonderland | The Adventures of Tintin | Adventures of Superman | Lois & Clark: The New Adventures of Superman | Batman Forever | Adventures of Superman (TV series) | Adventures of Huckleberry Finn | Batman (1989 film) | Virgin New Adventures | Batman (TV series) | The Adventures of Priscilla, Queen of the Desert | Tiny Toon Adventures | Ghost Adventures | Virgin Missing Adventures | Batman: The Animated Series | Batman Returns | The Adventures of Tom Sawyer | Batman Beyond | Alice (Alice's Adventures in Wonderland) | The Adventures of Tintin (TV series) | The Adventures of Sherlock Holmes | Eighth Doctor Adventures | Batman: Shadow of the Bat | The Sarah Jane Adventures | The Country Mouse and the City Mouse Adventures | The New Adventures of Old Christine | The Adventures of Pete & Pete | Dormouse (Alice's Adventures in Wonderland) | The Batman |
Along with his Tiny Toons partner Eric Radomski, Timm co-created and produced Batman: The Animated Series, which premiered on September 5, 1992, and went on to co-create and produce Superman: The Animated Series (premiered in September 1996), The New Batman Adventures (premiered in September 1997), and Batman Beyond (premiered in January 1999) and Static Shock which premiered at 2000.
He also did the voice of Detective Harvey Bullock on Batman: The Animated Series, Superman: The Animated Series, The New Batman Adventures and Static Shock, as well as in the theatrical release Mask of the Phantasm, and the video releases Batman & Mr. Freeze: SubZero, and Mystery of the Batwoman, He also played a vocal role in the 2010 video game Mafia II as Joe Barbaro and Frederico "Fat Derek" Pappalardo.
His cameos include the episode of Batman: The Animated Series "Beware the Gray Ghost", playing the toy shop owner, as himself in the episode of The New Batman Adventures, "Holiday Knights", and also as the leader of the Jokerz gang in Batman Beyond, which he joked he did under duress and also joked was "Emmy Award-winning material".