ThunderCats

Season 1, Episode 2

Episode Title: The Unholy Alliance

Air Date: 1985-01-23

Overview:

The Mutants, who have also reached Third Earth, encounter an old pyramid. It turns out to be the home of Mumm-Ra the Ever-Living, and they join forces to capture the Sword of Omens. Both the Mutants and Mumm-Ra attempt to attack Lion-O to possess the Sword, but miserably fail.