Clifford the Big Red Dog is an American/British educational animated children's television series, based upon Norman Bridwell's children's book series of the same name.Produced by Scholastic Productions, it originally aired on PBS Kids from September 4, 2000, to February 25, 2003. The UK version (where it was dubbed with British voice actors replacing the original American soundtrack) originally aired on BBC Two on April 1, 2002. John Ritter voiced Clifford in all episodes, though this was originally done by Canadian actor Brent Titcomb in the 1988 direct-to-video series. By the time the last of the 65 half-hour episodes and the subsequent film Clifford's Really Big Movie were completed, Ritter was back on ABC's prime time schedule, starring in 8 Simple Rules. Ritter's death on September 11, 2003, came less than two weeks after PBS debuted Clifford's Puppy Days. While no new Clifford episodes have been released since Ritter's death, voice actors for the main characters have reprised some of their roles for the Ready to Learn PBS Kids PSAs. Clifford's Really Big Movie serves as the series finale due to Ritter's death, as no new episodes were made to continue from where it left off (until the reboot in 2019). However, Clifford's Puppy Days still continued to air until its cancellation in 2006. On May 16, 2018, Scholastic announced a reboot of the series of the same name, which was released on December 6, 2019, on Amazon Prime Video and December 7, 2019, on PBS Kids, starring Adam Sanders as the new voice of Clifford. However, PBS Kids continues to air reruns of this animated series. As of 2021, the show is currently distributed worldwide by 9 Story Media Group. The show received generally positive reviews from television critics and parents of young children.