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")
Connections[]
| Valiant personnel | ||||||||||||||||||||||||||||||||||||||||||||||
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| Earth, United Nations Starfleet | SS Valiant | Carlos Tarasco • Geirrod Agnarsson • Chantal Coquillette • Davidoff • Dennis Gardenhire • Jack Gorvoy • Hollandsworth • Kolodny • Maciello • Marciulonis • McMillan • Marc Offenburger • O'Shaughnessy • Peavey • Dan Pelletier • Amir Rashad • Rivers • Rudolph • Siregar • Mary Anne Sommers • Womack • Yoshii • Zosky | 
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| Federation, Starfleet | USS Valiant (NCC-1223) | Lee Billings • Jonathan Fernandez • Friedman • Shiban |  
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| USS Valiant (NCC-1709) | Bhahani • Clarke • Mark Edwards • Franco • Green • Jeremy Haden • Linda Nozawa • Peter Schwartz | |||||||||||||||||||||||||||||||||||||||||||||
| USS Valiant (NCC-74210) | Ramirez • Tim Watters • Karen Farris • Nog • Riley Aldrin Shepard • Dorian Collins • Parton | |||||||||||||||||||||||||||||||||||||||||||||