<P> The series itself is a modernized version of the original Where Are You! series . It takes place in the 21st century and is more "realistic" than the previous, more cartoony incarnations, and features music from contemporary genres and all - new, original sound effects to replace the classic Hanna - Barbera sound effects . Even a distinctive thunderclap sound that was used frequently on older Scooby - Doo TV series was very rarely used on the series . A laugh track was only used for the Halloween special . The classic formula was also frequently parodied throughout (in a manner similar to A Pup Named Scooby - Doo), including the line "And I would've gotten away with it too, if it weren't for you meddling kids ." As such, it returns to the formulaic version of humans in monster disguises, rather than the real monsters and ghosts of the prior four direct - to - video films (or the 1980s versions that preceded them). </P> <P> The show was produced by Warner Bros. Animation, the successor to Warner Bros. Cartoons which was the studio famous for bringing the Looney Tunes / Merrie Melodies to life, which had by this time absorbed Hanna - Barbera Productions on March 12, 2001, after being bought by Time Warner from Turner Broadcasting System since their merger on October 10, 1996 . As is the standard for other classic Hanna - Barbera properties (Yogi Bear, The Flintstones, Wacky Races, etc .), the studio is still credited as the copyright owner, and Joseph Barbera, co-founder and co-chairman of the Hanna - Barbera studios, served as an executive producer alongside Sander Schwartz . Barbera's longtime partner William Hanna had died the year before . </P> <P> The band Simple Plan is strongly connected to What's New, Scooby - Doo? . They perform the theme song (written by Rich Dickerson), and appeared as themselves in the episode "Simple Plan and the Invisible Madman". Two of their songs appeared in chase scenes: "I'd Do Anything" in the episode "It's Mean, It's Green, It's the Mystery Machine" and "You Don't Mean Anything" in "Simple Plan and the Invisible Madman", which also had the song "The Worst Day Ever" serve as the song the band plays during a scene where they practice, and a scene where they are in concert . Also, they contributed to the theatrical movie Scooby - Doo 2: Monsters Unleashed . </P> <P> What's New aired for three seasons on The WB Television Network's "Kids' WB" programming block as a half - hour program, before being put on an indefinite hiatus in 2005, although the last episode, "E-Scream", was aired on Cartoon Network . Reruns have been shown on both Cartoon Network and its sister channel Boomerang . Each season contained thirteen normal episodes and one holiday - themed special . It also debuted on Boomerang and Cartoon Network in the United Kingdom and Ireland . In the United Kingdom, it also aired on CBBC, but currently airs on CITV . </P>

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