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The Iyaarans were a race capable of changing their shape.
In the mirror universe, by the 2340s, the Iyaarans had become worried about the actions of the Klingon-Cardassian Alliance and wished to see the Alliance destabilized. To this end, the Iyaarans sent Sestro to impersonate Jean-Luc Picard and infiltrate the Alliance. (STA - Mirror Universe short story: "The Traitor")