ThunderCats (1985 TV series) be quite divorced from what had gone before, with adventures consigned almost entirely to New Thundera, and most villainous opposition coming from either Mumm-Ra or assorted new villains. The Mutants, Lunataks, and Captain Cracker all returned for one episode each, however. In the series finale, several conclusions are reached: Despite its large cast of characters, "ThunderCats" featured a rather small circle of voice actors, with only six actors providing voices for the entire first season. Every actor provided multiple voices, although the distinctive baritone of Earle Hyman (Panthro) left the actor providing only very occasional guest voices in comparison with
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