Blondie (comic strip) was adapted into a long-running series of 28 low-budget theatrical B-features, produced by Columbia Pictures. Beginning with "Blondie" in 1938, the series lasted 12 years, through "Beware of Blondie" (1950). The two major roles were Penny Singleton as Blondie and Arthur Lake (whose first starring role was another comic strip character, Harold Teen) as Dagwood. Faithfulness to the comic strip was a major concern of the creators of the series. Little touches were added that were iconic to the strip, like the appearance of Dagwood's famous sandwiches—and the running gag of Dagwood colliding with the mailman amid a flurry of
What a Cartoon! was given its own series called "Megas XLR". From 2000 to 2003, "The Cartoon Cartoon Show" featured new episodes and reruns of the full-series Cartoon Cartoons, interspersed with premieres and reruns of the Cartoon Cartoon pilot shorts (some of which were retconned "WAC!" shorts). From 2005 to 2008, the block was revived, this time dropping the pilot shorts. Episodes from each show were anthologized into 7 or 11-minute segments. This is a list of shows that were presented on the block: What a Cartoon! What a Cartoon! (later known as The What a Cartoon! Show and The Cartoon Cartoon Show)