In the fictional universe of Mobile Suit Gundam Seed, the Agamemnon-class carrier is a large, wedge-shaped warship that can carry up to twelve mobile armors or mobile suits and deploy them rapidly using the linear catapults on either edge of the ship. The Agamemnon class also defends itself with two beam gun turrets and has extensive bridge facilities for service as a flagship. Until the development of the Archangel-class assault ship, the Agamemnon class is the largest and most powerful warship in OMNI Enforcer.

In CE 73, the Agamemnon fleet has been heavily modified, with the formerly sleek wedge widened across the beam and split into a fork arrangement to accommodate the new thickened and lengthened superstructure amidships for stand-up launch facilities for the GAT-02L2 Dagger L and GAT-04 Windam mobile suits. With the new arrangement, the former deck-edge linear catapults have been eliminated and all mobile weapons launch from the centerline catapult instead.

The Agamemnon and Menelaos are named for the Greek mythological heroes. The Doolittle was named for General Jimmy Doolittle, the Roosevelt for United States President Theodore Roosevelt or Franklin Delano Roosevelt, and the Oda Nobunaga for the famed 16th-century Japanese warlord.