R4-K5 was an R4-series astromech droid that served as a navigator aboard starfighters of the newly formed Empire.

When Anakin Skywalker fell to the Dark Side and became Darth Vader, he cast off his entire past. To further embrace this change, he painted his starfighter black and choose a black astromech droid to replace his former droid companion R2-D2. The outer darkness of his fighter and droid mirrored the inner darkness of the new Sith Lord.

R4-K5 flew with Vader in his customized Eta-2 Actis-class interceptor on early missions for the Galactic Empire.

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