Captain Bucephalus Dagger was the protagonist of Crisis Point II: Paradoxus; a story created by Ensign Brad Boimler. He was in command of the Sovereign-class starship USS Wayfarer.
He was once involved in with Helena Gibson as they had a weekend tryst on Risa.
Dagger and the Wayfarer were instrument in saving the USS Cerritos when they were attacked by the Romulan Melponar triplets. (LD: "Crisis Point 2: Paradoxus")