ThunderCats (comics) are held prisoner in Castle Plundarr while Wilykit and Wilykat are the personal servants of Mumm-Ra. This storyline was distinctly more mature than many episodes of the series, with much harsher language such as "bastard" used by Mumm-Ra. Cheetara is depicted as holding a grudge against Lion-O for "abandoning" his friends and leaving her to be abused by the Mutants and WilyKat's corruption in the earlier mini-series takes greater form. Realizing he has betrayed his friends, the older cub flees when the mini-series concludes. Lion-O and the ThunderCats emerge triumphant over Mumm-Ra once again. By the third mini-series, "The Dogs
Cartoon Network original character, a muscular teenage robot named TOM. During that same year, a series of bumpers featuring the instrumental Powerhouse were introduced. These bumpers lasted from 1997 to 2004. One new original series premiered in 2000: "Sheep in the Big City". On April 1, Cartoon Network launched a digital cable and satellite channel known as Boomerang, which was spun off from one of their programming blocks that featured retro animated series and shorts. Three new original series premiered in 2001: "Time Squad", "Samurai Jack", and "Grim & Evil". On June 18, Betty Cohen, who had served as Cartoon Network's president