Sarien Battle Cruisers are imposingly massive ships. They can easily overtake Xenon Starlabs. The Deltaur (original version) was of the Sarien Battle Cruiser design in the Space Quest I: The Sarien Encounter (original version) time line. Though Roger remembers encountering a Sarien Mantis-Class StarRipper battle cruiser instead. This was an apparent side effect of his time travel.