The Tollans old planet was undergoing a massive natural disaster, and the Tollans were forced to leave. Before going, they tried to bury the gate so no-one would travel there, however, before they could do that, they were caught in by the planets volcanic fumes and were suffocating to death when SG1 came and saved most of them. The planets gate is currently buried under molten rock, and the planet is uninhabitable.
 Key Episodes
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