Cyber-Klingon

In an alternate timeline shown to Jean-Luc Picard by the Eleventh Doctor, Cybermen were converted from the inhabitants of Qo'noS, homeworld, of the Klingon Empire, by 2418. The cyber-converted Klingons were seen occupying the First City. This timeline, a combination of N-Space and the Federation universe, was averted when the Doctor and Picard stopped the Cybermen before they could conquer the Borg Collective in 2368. (COMIC: Assimilation²)

Characteristics
The cyber-converted Klingons were externally similar to the Cybermen responsible for their conversion; (COMIC: Assimilation²) resembling those made by Cybus Industries in Pete's World, these Cybermen of N-Space were associated with the Cyber Legions. (TV: Rise of the Cybermen, A Good Man Goes to War)

Notably, the converted Klingons were distinguished from other Cybermen by their distinctive Cyber-helmets which matched the unique shape of the Klingon head, with extensions reminiscent of hair. In addition, their chest plates were adorned with the Klingon insignia.

Even as Cybermen, the Klingons wielded bat'leths as weapons and operated Birds-of-Prey as Cyber-ships. (COMIC: Assimilation²)