Scooby-Doo the head story editor on "Scooby-Doo" since 1983. Following the first season of "A Pup Named Scooby-Doo", Ruegger and much of his unit defected from Hanna-Barbera to Warner Bros. Animation to develop "Steven Spielberg Presents Tiny Toon Adventures" and later "Animaniacs", "Pinky and the Brain", and "Freakazoid!". From 1987 to 1988, Hanna-Barbera Productions produced "Hanna-Barbera Superstars 10", a series of syndicated TV movies featuring their most popular characters, including Yogi Bear, Huckleberry Hound, The Flintstones and The Jetsons. Scooby-Doo, Scrappy-Doo and Shaggy starred in three of these movies: "Scooby-Doo Meets the Boo Brothers" (1987), "Scooby-Doo and the Ghoul School" (1988),
Scooby-Doo Animation and Hanna-Barbera (by then a subsidiary of Warner Bros. following the merger of Time Warner and Turner Entertainment in 1996) began producing one new "Scooby-Doo" direct-to-video movie a year beginning in 1998. These movies featured a slightly older version of the original five-character cast from the "Scooby-Doo, Where Are You!" days. The first four DTV entries were "Scooby-Doo on Zombie Island" (1998), "Scooby-Doo! and the Witch's Ghost" (1999), "Scooby-Doo and the Alien Invaders" (2000), and "Scooby-Doo and the Cyber Chase" (2001). Frank Welker was the only original voice cast member to return for these productions. Don Messick had died