The Grim Adventures of Billy and Mandy is a American cartoon that originally aired on Cartoon Network from 2003 to 2008. It first aired on Boomerang in October 2013 and aired again from June 7, 2014 to January 4,2015. It returned to Boomerang's schedule on June 27, 2016 as part of Cartoon Network Retro, and left the schedule again on October 2, 2016. The series returned on March 6, 2017, replacing The Jetsons, and left the schedule again when the block ended on April 3, 2017. The series returned to Boomerang's line-up when the block returned on January 2, 2018.