Gunn started his career mainly as a screenwriter from the late 90s to the mid-2010s, writing the scripts of Tromeo and Juliet (1996), Scooby-Doo (2002), its sequel Scooby-Doo 2: Monsters Unleashed (2004) and the 2004 version of Dawn of the Dead. He then started to act also as director, starting with Slither in 2006. He subsequently wrote and directed the web series James Gunn's PG Porn and Super (2010). His next film Guardians of the Galaxy, based on the comic of the same name and a part of the Marvel Cinematic Universe, is planned for an August 1, 2014 release.