In the Kelvin timeline, the USS Yorktown (NCC-1717) was a Federation starship, a Constitution-class heavy cruiser flagship in Starfleet service in the 2260s decade. (STO - "Future Proof" mission: "Terminal Expanse")
In the year 2260, science officer 0718 was reassigned from the USS Enterprise to implement the Enterprise's tactics on destroying Sphere Builder constructs on the Yorktown. The Yorktown, under the command of Admiral Isaac Garrett, engaged Klingon D4x-class birds-of-prey in the Delphic Expanse when a 25th century starship from the primary universe arrived. The visitor was on a mission, led by Temporal Agent Timot Danlen, to assist in destroying the local command sphere.
Klingon warriors boarded the Yorktown. An away team from Danlen's ship defeated them on the Yorktown's bridge, and helped Admiral Garrett regain control. 0718 joined the away team when it beamed into the command sphere to set up charges, encountering Sphere Builders and more of their Klingon proxies, which they forced to retreat.
Defeating Sphere Builder ships, the Yorktown and its prochronistic ally set off the charges, destroying the sphere and preventing the spread of the revived Delphic Expanse. The time travelers bid goodbye, and the Yorktown had accomplished its mission. (STO - "Future Proof" mission: "Terminal Expanse")
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