As the ThunderCats continue to fortify their settlement on Third Earth, youngsters WilyKat and WilyKit decide that their former playmate Lion-O's rules about leaving the compound are too restrictive. But after striking out on their own to explore their new planet, they discover a terrifying secret - one that could have devastating consequences for the last survivors of Thundera! Collects issues #6-10 of the hit series, and features a complete cover gallery!