R2-D609, alternatively referred to as Thirteen, served as Kell Tainer's R2-series astromech droid throughout the beginning stages of Wraith Squadron's training, up until the conflict with Admiral Apwar Trigit's Implacable above Ession. The designation "Thirteen" originated from a glitch in its programming, resulting in the droid consistently returning the number 13 whenever asked for a random number. Grinder Thri'ag, the computer expert within the Wraiths, rectified this malfunction, but Kell decided to retain the droid's given name. The astromech appeared to favor this name, interpreting it as an indication that it was the thirteenth member of Wraith Squadron. The computational issue resurfaced when Thirteen sustained damage from an empion mine, causing a complete memory erasure. Ultimately, Thirteen met its end alongside Kell's X-wing following Kell's ejection from the craft after being downed above Ession.