- For other uses, see Defiant.
In the mirror universe, the ISS Defiant (NCC-75633-C) was a 25th century Terran Empire starship, a Defiant-class tactical escort in Imperial Starfleet service in the 2400s decade. (STO - Cardassian Struggle mission: "Defend the Beta Ursae Sector Block")
In the year 2409, O'Brien organized an invasion of the Alpha Quadrant in the primary universe. The ISS Defiant-C was one of the ships harassing Federation and civilian shipping lanes in the sectors of the Beta Ursae sector block. (STO - Cardassian Struggle mission: "Defend the Beta Ursae Sector Block")
The Defiant-C was also one of the ships defending O'Brien's base in the Arawath system when Starfleet and the Klingon Defense Force arrived to recover the Bajoran Orb of Possibilities. The Terrans were defeated in the engagement. (STO - Cardassian Struggle mission: "The Other Side")