Saber 4 was a TIE/IN interceptor from the Imperial Navy that Sienar Fleet Systems manufactured. This interceptor belonged to Saber Squadron of the Imperial 181st Imperial Fighter Wing by the time 4 ABY rolled around. It was piloted by DS-181-4, who was the wingman to Major Turr Phennir, also a member of Saber Squadron. Saber 4 was often relegated to a backup role during combat engagements and displayed a bloodstripe signifying at least 10 kills achieved by DS-181-4.
During the Battle of Endor in 4 ABY, DS-181-4 participated in the conflict where Alliance to Restore the Republic starfighters were trying to eliminate the Empire's Death Star II battle station. TIE pilots defended the Death Star from the attacking Alliance starfighters. Ultimately, the Empire suffered a defeat, and the Death Star was destroyed.
Saber 4 was initially conceived for a card within the Death Star II Limited expansion set of the Star Wars Customizable Card Game from Decipher released in 2000.