More and more earthquakes are ocurring because of the malfunctioning Gyroscope. Meanwhile Lion-O recieves a distress signal from Thunderian refugees, and he, Cheetara, and Snarf go to find them. Mumm-Ra resurrects Grune the Destroyer, and Grune seeks out Lion-O and Cheetara. Grune finds and fights them, breaks the Sword of Omens, and then he chains them up on the Churning Rocks. Snarf, who was hiding, gathers the pieces of the Sword to take back to Bengali to be fixed. Snarf gets captured by Char, a theif who wants the Sword for himself. Snarf tricks him into reforging the Sword, and when it is as good as new, Lion-O begins to sense it, and so he calls it. The Sword goes to him, he escapes, and then he defeats Grune. But Mumm-Ra still has the Gyroscope's regulator... (thetvdb.com)