The USS Excalibur (NCC-2004) was a Federation Excelsior-class explorer that saw service during the 23rd and 24th centuries. (Star Trek: The Excalibur Epics)

The Excalibur was the first known Starfleet vessel to make contact with the Vendoth "several decades" before the USS Cantabrian-A encountering them in 2376. (Star Trek: The Cantabrian Expeditions: "Howl")

Also in 2376, the Excalibur took part in the Battle of Sol. (Star Trek: Unity (crossover): "United We Stand - Together")

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