The right-hand man of John Frederick Paxton, who runs security at the Orpheus mining facility and enforces Terra Prime's campaign against the alien presence on Earth.
Daniel Greaves appears in Demons and Terra Prime, the two-part Enterprise story set in 2155, and is played by Peter Mensah. He is the most trusted subordinate of Paxton, leader of the isolationist Terra Prime movement.
Greaves oversees the day-to-day running of the Orpheus mine on the Moon and deals with anyone who threatens the cause. He is on hand when Trip Tucker and T'Pol, who arrive undercover, are exposed and brought before Paxton.
When the facility relocates to Mars and takes over the verteron array, Greaves commands its defence. He is overcome when Jonathan Archer's team breaks in, and Paxton's plan to fire on Starfleet Command fails.