Trekipedia

Calhoun, Mackenzie

Xenexian. In the late 24th century, Calhoun commanded the U.S.S. Excalibur NCC-26517^[1] and the U.S.S. Excalibur NCC-26517-A.^[2]

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STO Timeline

In 2409, Calhoun was assigned as a “Battle Master” on the Klingon Front aboard Deep Space Station K-7.^[3]

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Mirror Universe

After freeing Xenex from its Danteri oppressors, M’k’nzy of Calhoun was taken from his homeworld to Romulus, where he eventually met Soleta and came into possession of the Excalibur, an experimental craft that used the godlike powers of Mark McHenry as a power source.^[4]