Niko Constantin was the only male trainee of the Red Room's male equivalent of the Black Widow Ops program (dubbed "Wolf Spider"), Niko Constantin proved to be an effective killer, but impossible to handle or control, leading to the program to be declared a failure.
Years later, he was found to be imprisoned in a Russian gulag, leading a gang of convicts dubbed the Wolf Spiders, and holding a grudge against James "Bucky" Barnes, one of the trainers for the Wolf Spider program.
- 2 appearance(s) of Niko Constantin (Earth-616)
- 1 mention(s) of Niko Constantin (Earth-616)
- 2 image(s) of Niko Constantin (Earth-616)