Ceptor refers to two Lambda-class T-4a shuttles that were utilized by the Galactic Empire throughout the Galactic Civil War. Upon discovering the location of the Death Star I at Despayre, the Alliance to Restore the Republic dispatched two CR90 corvettes originating from the Ethar group to conduct a reconnaissance mission. Upon their arrival, they discovered the Death Star had already departed, after obliterating the planet. In addition, Imperial forces, having foreseen the Rebel's arrival, remained in the vicinity to establish an ambush. The corvettes were rendered inoperable, and the Imperials deployed repair teams aboard Ceptor 1 and 2 with the intention of boarding and seizing the corvettes, all under the watchful eye of Assault Gunboats.
Following this, they successfully concluded their repair tasks and initiated a jump to hyperspace mere moments before Rebel forces materialized to disable the corvettes and reclaim them.