Batman Beyond: Return of the Joker. Timm made a cameo appearance in the 2009 film Green Lantern: First Flight as Bug Boy. He played The Riddler in the 2010 film Batman: Under the Red Hood and appeared as Galius Zed in the 2011 film Green Lantern: Emerald Knights. Comics Outside of his work in animation, Timm's first ambition was to become a comic-book artist and has thus produced several one-shots and miniseries, mostly for DC Comics. His earliest comic book work was drawing He-Man and other Masters of the Universe mini-comics that would be packaged with Mattel toys in the 1980s. In 1994, Timm and writer Paul Dini won both the Eisner Award for Best Single Story and the Harvey Award for Best Single Issue or Story for Batman Adventures: Mad Love. Timm won the same Eisner prize the next year as well, for Batman Adventures Holiday Special, (a one-shot with several Christmas-themed stories) with Dini, Ronnie del Carmen, and others. Later, Timm was involved with Batman Adventures and has also worked on Avengers and Vampirella. In 2000, he did the art for an issue of DC's Vertigo imprint horror title, Flinch. Timm co-created Harley Quinn (with Dini), working from Dini's original design. Harley's popularity on television led to her inclusion in the mainstream DC Universe. In 2004, Timm and Dini (assisted by Shane Glines as inker) released a three-issue Harley and Ivy miniseries, which was in the works for years. Timm also drew the 1999 Avengers 1½ special for Marvel Comics, written by Roger Stern. In 2005, he contributed artwork for two comics. One was a short story in Conan #18, titled "Conan's Favorite Joke". The other was a Black Canary short story in Birds of Prey #86. Timm provided the art work for a short two-page Harley Quinn origin story for Dini's Countdown in 2008. Timm was featured in "Conan Gets Animated", a skit in the December 9, 2010, episode of the TBS late night talk show Conan, in which host Conan O'Brien enlisted his help in designing a new superhero, based on O'Brien's specifications. The superhero, who was designed to resemble O'Brien, included a typically muscular superhero body and costume with chest insignia, as well as idiosyncrasies such as an oven mitt, a jai alai glove, golf shoes, sock garters, and fishnet stockings.<ref>"Conan Gets Animated", Conan, TBS, December 9, 2010</ref> One month later, O'Brien aired a clip