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Gabriel. I really hoped you were dead.
~ Stamets, to the Mirror Lorca
Paul Stamets is an antagonist who was introduced in the Star Trek: Discovery episode "The Wolf Inside".
Just like his primary universe counterpart, he was portrayed by Anthony Rapp.
Stamets served in the Terran Empire'sStarfleet. Stamets was a astromycologist. In the 2250s he worked to develop a means of harnessing a new energy source for the Empire to use.
Through his work, Stamets also discovered the mycelial plane and began working to manipulate it for his own purposes. Initially supporting Gabriel Lorca, Stamets switched sides and went to the Emperor in order to continue his work. Stamets was able to contain mycelial spores in a containment field on board the Emperor's flagship ISS Charon.
His actions caused corruption to begin spreading through the network, threatening the very structure of the network itself, which would result in the end of all life in all universes. Stamets eventually became trapped in the network, with his physical body falling in to a coma. After becoming trapped, his physical body was kept in his lab on board the Charon.
After his primary counterpart also became trapped in the network, Stamets went to greet his counterpart. Stamets tried to get his counterpart to help him correct the corruption in the network. However, the primary universe version of Dr. Culber warned his counterpart not to cooperate, and explained that Stamets was responsible for the corruption.
Stamets returned to the physical universe at the same time as his counterpart, waking up at about the same time. He hid behind a holographic camouflage, but Lorca and his people were able to find him. After an oversight allowed the Emperor to escape, Lorca decided that Stamets use to him had come to an end, and at his signal Ellen Landry vaporized him with a phaser.
His primary universe counterpart and the crew of the Discovery were able to free the spores trapped in the Charon's containment field. Once released the network began to heal again, and the spores gave means for Discovery to jump back to their home universe.