Clifford's Really Big Movie is a 2004 American children's animated film loosely based on the book series, Clifford the Big Red Dog by Norman Bridwell and more based on the classic PBS Kids TV series adapted from it. This film was directed by Robert C. Ramirez, produced by Scholastic Corporation's film division, Scholastic Films in association with Big Red Dog Productions, and originally released to theaters by Warner Bros. on February 20, 2004. This was John Ritter's final film role as he had died of aortic dissection on September 11, 2003, after completing voice work for the film as Clifford. The film was dedicated to his memory and also serves as the series finale to the show as no new episodes were produced to continue from where it had left off.