He-Man/ThunderCats defeated villains and Cringer runs into He-Man's arms thrilled his best friend is alive. The three rush back to the ship desperate to get back to Eternia before it is too late. The four Ancient Spirits of Evil have arrived on the doorstep of Castle Grayskull while Skeletor and Mumm-Ra look on. Randor has assembled an army alongside the Thundercats and the combined heroes attack the giants. Man-At-Arms, Tygra, and Panthro assemble a cannon of combined Eternian and Thundarian tech to attack the Spirits while the others buy them time. Inside the Castle the Sorceress summons the Castle's defenses to
He-Man/ThunderCats friends and He-Man and Lion-O rush into the Castle. He-Man guides Lion-O through the maze of Castle Grayskull saying it is a nexus of worlds and reality through space and time and they must find the Sorceress before it's too late. They arrive at a shattered door that shocks He-Man as he says no intruder has ever gotten so far into the Castle. Both heroes charge forward and find the newly formed Mummator imprisoning the Sorceress and holding an orb that is the heart of the Castle, the key to all the power that Greyskull possess. Mummator says that he