The fourth season of American animated comedy television series Regular Show, created by J.G. Quintel, originally aired on Cartoon Network in the United States. The season ran from October 1, 2012 to August 12, 2013. Quintel originally created the series' pilot using characters from his comedy shorts for the cancelled anthology series The Cartoonstitute. He developed Regular Show from his own experiences in college, while several of its main characters originated from his animated shorts 2 in the AM PM and The Naive Man from Lolliland. Following the success of its first season, Regular Show was renewed for a 37-episode fourth season on October 26, 2011. Regular Show's fourth season was storyboarded and written by Calvin Wong, Toby Jones, Andres Salaff, Madeline Queripel, Benton Connor, Hilary Florido, Sean Szeles, Kat Morris, Sarah Oleksyk, Hellen Jo, James Kim and Owen Dennis, while it was produced by Cartoon Network Studios. The season began on October 1, 2012, with a special 30-minute season premiere, "Exit 9B". Regular Show is rated TV-PG for suggestive humor – certain episodes are rated TV-PG-V for mild to moderate violence, including peril and non-fatal use of weapons and firearms. Other specials that aired within the season include the Halloween special "Terror Tales of the Park II", a Christmas special, and the 100th episode of the series. The character Thomas was introduced in the season premiere, working as an intern for the park in which the series primarily takes place.