A spaceship approaches third Earth and it sets off all the alarms of the ThunderCats, Mutants and even Mumm-Ra. It contains enough radioactive material to put an end to the ThunderCats. Jackelman takes the recovered materials first and Mumm-Ra takes it from him. The ThunderCats battle Mumm-Ra on top of the Dark Pyramid for the sphere and eventually win, setting the materials to explode safely in space.
Elenco:
Bob McFadden
,
Larry Kenney
,
Earl Hammond
,
Lynne Lipton
,
Earle Hyman
,
Peter Newman
,
Gerrianne Raphael
,
Doug Preis
,
Will Friedle
,
Emmanuelle Chriqui
,
Kevin Michael Richardson
,
Matthew Mercer
.