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	SAREK PLAYED BY: Mark Lenard SPECIES: Vulcan Mr. Spock's father and Vulcan Ambassador to, in the altered timeline, 17 Federation worlds. When his son was killed, he divorced from his wife and remained unmarried. In the correct, restored timeline, he persuaded the Young Spock to pursue Vulcan philosophy instead of Human, was shamed by his son's emotional behaviour, and would not accept failure from the Young Spock.
	AMANDA GRAYSON PLAYED BY: Majel Barrett SPECIES: Human Mr. Spock's mother and wife to Sarek. In the altered timeline, when her son was killed in the Vulcan Forge, she divorced from Sarek and was killed in a shuttlecraft accident on her way back to Earth. In the restored timeline, she remained married to Sarek.
	COMMANDER THELIN PLAYED BY: James Doohan SPECIES: Andorian In the altered timeline, Thelin was first officer of the U.S.S. Enterprise for five years under Captain James T. Kirk. During that time, the crew always treated him with respect. Thelin possibly ceased to exist when Mr. Spock returned to Vulcan's past to save his younger self.
	YOUNG SPOCK PLAYED BY: Billy Simpson SPECIES: Half Vulcan, Half Human Son of Sarek and Amanda and future first officer of the U.S.S. Enterprise. As a child, the young Spock was tormented for being half-human by his Vulcan peers and was unable to perform a Vulcan neck pinch. He attempted to prepare himself for the Vulcan Kahs'wan ordeal in the The Forge, but in the process, was attacked by a Lamacha. He would have been killed if his cousin Selek (his future self) hadn't subdued the creature. During this incident, his pet Sehlat, Ay-Chia, was poisoned. Spock made the logical choice to end his pet's suffering and chose a Vulcan way of life. He was able to master the Vulcan neck-pinch thanks to the help of "Selek."
	LIEUTENANT ERIKSON PLAYED BY: James Doohan SPECIES: Human Historian of the U.S.S. Enterprise who travelled with Captain Kirk and Mr. Spock to Orion's past via the Guardian of Forever on a historical observation mission.
	HEALER PLAYED BY: James Doohan SPECIES: Vulcan Vulcan medicine man who was summoned by the young Spock to help his wounded Sehlat in The Forge. When the Young Spock decided to end his pet's suffering, the Healer euthanized the animal.
	SOPEK PLAYED BY: Keith Sutherland SPECIES: Vulcan Vulcan child who tormented the young Spock for being half-human and thought Sarek shamed Vulcan for marrying a human.
	GREY PLAYED BY: Majel Barrett SPECIES: Human Human female part of the historical observation mission to Orion's past.
	ALEEK-OM PLAYED BY: James Doohan SPECIES: Skorr/Aureilan Member of the bird-like Skorr race, Aleek-om was part of the historical observation mission to Orion's past. (Other sources list Aleem-Om as being an "Aurelian" but based on the future appearance of another of his race in "The Jihad", its best to infer that Aleek-Om is in fact a Skorr.)
	THE GUARDIAN OF FOREVER PLAYED BY: James Doohan SPECIES: Immortal Time Portal Since before Earth's sun burned hot in space and before the human race was born, the Guardian of Forever awaited a question. Designed as a gateway to the past, the U.S.S. Enterprise visited its planet on stardate 3134. When Dr. McCoy leapt through its portal and travelled to 1930s Earth, he altered the course of history causing the Enterprise, Starfleet and the Federation to cease to exist. After Kirk and Mr. Spock restored the timeline, the Federation used the Guardian of Forever for historical observation missions. Mr. Spock used the Guardian of Forever to travel to Vulcan's past to become his own cousin and save his younger self's life.

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