Department K is a covert special branch of the Canadian government.^[3]

They were responsible for reviving the original Weapon X Program,^[4] experimenting on various operatives such as Garrison Kane and Wade Wilson. Years later, Kane became the new Weapon X and K's top operative.^[3][5]

Former Weapon X Program subject Logan briefly joined Department K, working with C.I.A. agents Richard and Mary Parker.^[6] He fought against Sabretooth and the Hellfire Club, until he was fired after a case of homicide.^[7]

Department K also organized a complete strike team known as Weapon P.R.I.M.E..^[8]

They were also apparently responsible for the behavioral reconditioning that changed Wild Child into Weapon Omega for a time.^[9]