Derell was a male Cardassian and member of the Cardassian military.

In 2358, Derell was assigned to the Infirmary on Terok Nor and often visited Quark's. (ST CCG: Deep Space Nine)

In 2369, Derell was serving on the Prakesh when Dukat ordered the vessel to the newly established Deep Space 9. Derell and the crew came aboard for shore leave in Quark's. (DS9 episode: "Emissary")

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