You might also be looking for the episode, "Firewalker."

Firewalker was the name given to a titanium robot created by Doctor Daniel Trepkos, a vulcanologist from the California Institute of Technology. It was built to help study active volcanoes with a live video feed in high temperate areas and gather samples. It was recovered from Mount Avalon and was irreparably damaged. (TXF: "Firewalker")

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