
The Haydonite Cruiser was a type of ship used by the Haydonites in their crusade to wipe out Protoculture.
After the Deukalion and the SDF-3 tested one of the Neutron-S missiles on a lifeless planet in the Omicron Sector, a number of Haydonite ships attacked, only to be interrupted by the Icarus which managed to Space Fold back with the Deukalion, leaving the SDF-3 to an unknown fate.
The Haydonites later attacked the Robotech Expeditionary Force and used the Trojan Horse technology they snuck into the ships to disable their Synchro Cannons and cause them to self detonate, which destroyed a majority of the Earth fleet (Robotech: The Shadow Chronicles).