The O'Neill-class ship was the most advanced warship in the Asgard fleet, and the first series of Asgard ships designed solely to fight the the Axis. Named in honor of Jack O'Neill of the Tau'ri, O'Neill-class ships dwarfed cruiser class vessels in both size and firepower. These vessels carried the most advanced weapons created by the Asgard (excluding their plasma beam weapons which were developed later after their participation in combat against the Ori motherships). The O'Neill-class replaced the Bilskirnir-class ship as the Asgard vessel of choice when engaging hostile forces during the Second War.

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