ThunderCats (comics) entered the Book of Omens to begin his training and claim his rightful place as Lord of the ThunderCats, but Mumm-Ra uses a powerful spell to keep Lion-O trapped in the book for several years in real time, not "Book" time, and seizes control of Thundera afterwards. In the follow-up mini-series, "The Return" (written by Gilmore and illustrated by Benes, Pimental and Lea), published in 2003, Lion-O returned to Thundera to find it enslaved to Mumm-Ra. Several of the ThunderCats are scattered. Panthro, who was left in charge while Lion-O was away, was forced into slave labor. Tygra and Cheetara
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)