As they work to fortify their new home on Third Earth, the ThunderCats must venture ever further into its unexplored regions. Panthro starts things off with a bang when he powers up the THUNDERTANK to search for critically needed Thundrillium, only to find an enemy ambush instead! And when young WilyKat and WilyKit decide that the rules about leaving the settlement are too restrictive, their exciting explorations into the unknown reveals a terrifying secret - one that could have devastating consequences for the last survivors of Thundera!
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