Captain Sisko: While acting as commander of Deep Space 9, Benjamin Sisko was promoted to captain. When the station was abandoned to the Dominion, he became captain of the tactical vessel U.S.S. Defiant.

Jem'Hadar: The Jem'Hadar are the military branch of the Dominion. Genetically engineered in birthing chambers, adults of the species require no sleep and little food, and possess a natural cloaking effect.