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Geirrod Agnarsson was a 21st century human male who served as chief engineer aboard the SS Valiant. When the ship breached the Galactic barrier, Agnarsson was the crewmember who mutated into a superhuman with psionic abilities. He slaughtered crewmembers until Captain Carlos Tarasco used the ship's self-destruct to destroy the mutated engineer. (TOS episode: "Where No Man Has Gone Before", TNG novel: The Valiant, TOS comic: "IDW Star Trek, Issue 1")


Valiant personnel
Earth, United Nations Starfleet SS Valiant Carlos TarascoGeirrod AgnarssonChantal CoquilletteDavidoffDennis GardenhireJack GorvoyHollandsworthKolodnyMacielloMarciulonisMcMillanMarc OffenburgerO'ShaughnessyPeaveyDan PelletierAmir RashadRiversRudolphSiregarMary Anne SommersWomackYoshiiZosky Seal of United Nations Earth image.
Federation, Starfleet USS Valiant (NCC-1223) Lee BillingsJonathan FernandezFriedmanShiban UFP emblem image. Starfleet emblem image.
USS Valiant (NCC-1709) BhahaniClarkeMark EdwardsFrancoGreenJeremy HadenLinda NozawaPeter Schwartz
USS Valiant (NCC-74210) RamirezTim WattersKaren FarrisNogRiley Aldrin ShepardDorian CollinsParton