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ChromaStone is named in the credits, but at the end of the episode it is revealed that the name of the alien whose DNA sample was taken for the Omnitrix is Sugilite, now brought back into existence through a back-up sample in the Omnitrix.
In the twelve episodes featuring ChromaStone, this is the only episode where "ChromaStone" is misspelled in the credits with just a lower case S.