|First appearance:||Proof of Purchase|
X6-252 was an X6 that Alec McDowell found during his hunt for Transgenic barcodes to get rid of the explosive that Ames White had had implanted in his brain stem. Alec led the younger Transgenic into a secluded section and strangled the X6 until he presumly lost his consciousness, then proceeded to cut out the barcode from the Transgenic's neck.
X6-252's fate is unclear until Alec later meet up with White to negotiate for more time to hunt for the third barcode. White lets the dead body of he X6 fall from the metal cage after finding the transgenic at a hospital.