Balthorium G is a very rare mineral which is necessary to power the Candle's melting ray. ("The Obsolescent Cryogenic Meltdown")

It is a reference to the movie Dr. Strangelove, where "Balthorium G" is mentioned by one of the characters as a possibly-intentional mispronouncement of "Cobalt-Thorium G," (an additive to be used in an atomic weapon to make it a doomsday device).
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