Claim: Cartoon Network released in the United States its first high definition original series on October 3, 2008, the Secret Saturday by Canadian cartoonist Jay Stephens.
Evidence: The Secret Saturdays is an American animated television series created by Canadian cartoonist Jay Stephens for Cartoon Network. It debuted on October 3, 2008, in the United States. The Secret Saturdays was the first Cartoon Network original series to be broadcast in high-definition. United States