The unstoppable tag team of writer DECLAN SHALVEY and artist DREW MOSS return for a brand-new story arc, and they kick things off with a bang as Panthro powers up the THUNDERTANK for its first appearance in the hit new series! 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!