A Sphere was a type of starship vessel used primarily for combat by the Kaylon species.  Each Cruiser was equipped with one Interceptor, which served as an auxiliary craft.  All spheres were equipped with highly advanced technology, a single central cannon with incomparable firepower and a hull that resisted target-locking from conventional targeting scanners.  Cruisers are capable of sustained quantum travel at 35 lightyears per hour.