The couple met in army boot camp, long before they were involved in any espionage activity. The pair were very competitive and would compete in every exercise and training scenario they were tasked.
After the "Maximum Security" incident, John Walker was made leader of the new organization called S.T.A.R.S. (Superhuman Tactical Activities Response Squad). Agent Vries was made co-leader, apparently thanks to the influence of Senator Warkovsky.
John Walker, from day one, was concerned that she was after his job. He became even more annoyed after their first mission together. The team was sent to capture Machete (Ferdinand Lopez), who was trying at the time to sell mind-control organisms to the organization Hydra.
Agent Walker managed to capture their target but Hydra caught up with them. Vries helped Walker escape but also killed Machete with a bullet to the head. Vries claimed it was an accident while in conflict.
The team kept investigating the case of the mysterious organisms even though Senator Warkovsky was the one behind their distribution and Vries was aware of it. The Senator assigned her to attach one of the creatures to Walker.
Vries later tried to seduce Walker while seeking an opening to follow her orders. Vries thought her job was a success and reported back to Senator Warkovsky. Kali Vries believed she had gained his trust and wanted to find the source of the mysterious life forms, but Senator Warkovsky did not trust her enough for that. Kali Vries contacted Captain America and set out to rescue Walker.
The Power Broker was revealed to be the supplier as he had become the host of an alien and these organisms were her "children". The rescue mission went wrong, as Walker had only been faking being under the influence of the Broker.
The Power Broker placed an organism on Vries and used her against Walker. Walker defeated her and freed Vries from the mind-control. The three allies then took care of the Broker. Dum-Dum Dugan informed Walker that Vries was supposed to earn Senator Warkovsky's trust and find out who supplied him with the alien organisms. The death of Machete was later revealed to be truly an accident.
At the end of the mission, Agent Vries left the STARS. Vries tried to reconcile with Walker but due to the broken trust between them, he could not accept her apology. He was later seen burning photos of the pair together.
- 3 appearance(s) of Kali Vries (Earth-616)
- 1 minor appearance(s) of Kali Vries (Earth-616)
- 2 image(s) of Kali Vries (Earth-616)