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This page details George Samuel Kirk, Jr. in the primary universe; for George Samuel Kirk, Jr. in the mirror universe see George Samuel Kirk, Jr. (mirror); for the George Samuel Kirk, Jr. in the Kelvin timeline created by Nero's temporal incursion see George Samuel Kirk, Jr. (Kelvin timeline).
This character is a member of the Kirk family.

George Samuel "Sam" Kirk, Jr., the eldest son of Winona and George Samuel Kirk, Sr., and brother of James T. Kirk, was born on 12 August 2230. Unlike James, he was a scientist, a research biologist, and mainly worked and lived on the planet Deneva with his wife Aurelan and three sons Peter, Alexander, and Julius. (TOS novel: The Last Roundup, ST website:

In the late 2240s, George was already an accomplished scientist, and spent some time on Ganjitsu where he and Winona became good friends with Hikaru Sulu and his parents Hosato Sulu and Shimizu Hana. (TOS novel: Enterprise: The First Adventure)

George traveled from colony to colony aboard an old Andorian merchant ship he owned, later sending for his family once he had established and set up their new home. (TOS eBooks: Mere Anarchy, Shadows of the Indignant)

In 2264, Kirk visited Earth, for him and his mother to attend the change of command ceremony of the USS Enterprise from Captain Christopher Pike to James. (TOS novel: Enterprise: The First Adventure)


Unfortunately, George and Aurelan died on Deneva in 2267, following the invasion of neural parasites. However, he was survived by his three sons. (TOS episode & Star Trek 2 novelization: Operation -- Annihilate!)

Among those at Sam’s funeral were James T. Kirk, son Peter, Carol Marcus and David Marcus. (TOS - Year Four comic: "The Enterprise Experiment, Part 3")



According to "Echoes of Yesterday" in the third TOS DC Comics special, George was born September 7, 2229, and his death took place on April 13, 2267.

As James T. Kirk "reflects" on having lost a brother (referring to Spock's death), George's reflection is in the viewport of the USS Enterprise-A. (TOS comic: "Star Trek V: The Final Frontier")

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