Overpowering Snowman and Snowmeow, the Luna-Taks gain entrance to an old Thundrillium mine on Hook Mountain. During the battle with Snowman, the Luna-Taks cause a forest fire, which Snowman attempts to extinguish, while Snowmeow seeks the Thundercats' help. Inside the mine, the Mad Bubbler, a reptilian creature of pure evil, entrances the Luna-Taks, resulting in them becoming more evil than they were originally. They attacked one another; Chilla attacks, Luna and Amok, and then flees to spread havoc around Third Earth. Snowmeow reaches the Thundercats who take the Feliner to Hook Mountain and extinguish the fire. However, the fire caused the mountain's snow to melt and Snowman is carried away in the flood. Panthro attempts to rescue Snowman from a swirling basin but fails. Just as they are both about to plunge over the mountain's side to their doom, the Thundercats rescue them with the Feliner. While battling the Luna-Taks in the mine, the Thundercats are entranced by the Mad Bubbler. They turn evil and try to destroy one another. The Sword alerts Lion-O to the Thundercats' dilemma and he rushes to Hook Mountain. En route, a Berbil informs him of the legend of the mine: whoever enters will be destroyed by the evil in his own heart. On the mountain, Snowman begins to dissuade Lion-O from entering the mine, when Jaga appears and tells Lion-O Snarfs do not possess any evil at all and therefore they are immune to the Mad Bubbler's power. Lion-O summons Snarf and Snarfer to the mine where they succeed in provoking the entranced Thundercats to chase them out of the mine. An awaiting Lion-O uses the Sword's power to project a beam around the Thundercats, thus breaking the Bubbler's spell.

The Luna-Taks ignore superstition and warnings from Snowman about entering into a Thundrillium mine on Hook Mountain. The caution and superstition prove to be well-founded, as the Luna-Taks find out, when they encounter the Mad Bubbler, who lives in the mine. Restraints are undone, and individuals under the Bubbler's spell feel they must destroy or be destroyed. When Panthro, Cheetara, and Tygra also ignore Snowman's warning and enter the mine to prevent the Luna-Taks from stealing Thundrillium, they too fall under the spell. Upon discovering what has happened, Lion-O at first does not believe what he learns from Ro-Bear-Bill, that those who enter the mine are destroyed by the evil in their own hearts. But Jaga confirms this in instructing Lion-O about the capacity of good and evil that exists in every creature except the species of Snarf. Using what he has learned, Lion-O sends Snarf and Snarfer into the mine where, unaffected by the Bubbler's gas, they are able to beat the Thundercats out of the mine and back to normality.

Lion-O in the Thundercats learned a lesson about human nature that applies to all of us. Each of us carries within ourselves the capacity for doing right and wrong. If we deny we have potential to do wrong, we fool ourselves and often commit a greater wrong in thinking we are different. When we make fun of others or bully them, we do it because we think we are superior to them, as if we are incapable of doing the same thing. Being good does not mean we are incapable of doing wrong. It means we freely choose to do right rather than wrong. It means we recognize our common humanity with others and the moral choices we make.

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Disc 3

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