The NX-class Endeavour was a Earth Starfleet explorer starship in Earth Starfleet service in the 22nd century. During the Earth-Romulan War, Endeavour (NX-06) was commanded by Captain William McCarthy, an ancestor of the 24th century Starfleet officer Richard Boswell. The Endeavour's first officer was Christopher Tomczyk. (Star Trek: Remington: Anthologies: "Endeavour")