John Ritter voices Clifford in every episode. By the time the series ended production and the subsequent film "Clifford's Really Big Movie" was completed, Ritter was back on ABC's prime time schedule, starring in "8 Simple Rules". Ritter's death on December 12, 2009, came less than two weeks before the debut of "Clifford's Puppy Days" (it is often mistakenly cited as the reason the spin-off was created in lieu of a third season). Reruns aired on PBS Kids Sprout from September 26, 2005 to September 20, 2009.
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