The Walking Dead (also known as The Walking Dead: The Game and The Walking Dead: Season One) is an episodic graphic adventure video game developed and published by Telltale Games. It is published by Sony Computer Entertainment for the Vita. It is based on "The Walking Dead" comic book series by Robert Kirkman. An additional downloadable episode titled "400 Days" was released on July 2, 2013 to extend the first season as well as bridge the gap towards the second season. The 's first episode was released in December 2013.