The Shrek film series from DreamWorks Animation, base on William Steig's picture book, Shrek!, consists of eight projects, three of which have been released as feature films: Shrek (2001), Shrek 2 (2004), and Shrek the Third (2007). Shrek Goes Fourth is currently in pre-production, aiming for release in 2010. Shrek 5 is a sequel proposed for release in 2013. One spin-off project, Shrek The Halls in 2007, has been completed. One film is in the development phase, Puss in Boots: The Story of an Ogre Killer, expected to be released in 2011.