The mellitus was a lifeform from Alpha Majoris I colloquially referred to as a "cloud creature". In its normal state, as it moved, it existed as a gas held together by a highly cohesive electromagnetic field. When the mellitus stopped, however, it became solid.

In 2267, the USS Enterprise computer considered it a similar entity to Redjac entity. Hengist dismissed the lifeform as being nothing more than something out of a fairy tale, but Captain James Kirk recalled that he had seen the mellitus in person. (TOS: "Wolf in the Fold")

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