The Avenger-class was a type of scout starship deployed by the United Federation of Planets in Starfleet service in the mid-23rd century. In 2270, the USS Halcyon, an Avenger-class scout, was destroyed after encountering an interdimensional rift. (TOS short story: "Intersection Point") The Halcyon is the only vessel known to belong to the Avenger-class in Star Trek literature. Some fan fiction sources have associated Avenger-class vessels as a variation of the Miranda-class, but no licensed sources have ever referenced such details about the ships' design.