As a young man Eric was a member of the Nazi Party, however always doubtful of Hitler's leadership. He was convinced by Nick Fury to switch sides, and soon became one of his most trusted friends, and a founding member of SHIELD. He continued to work for S.H.I.E.L.D for 28 years until it was decommissioned into H.A.M.M.E.R.
After S.H.I.E.L.D. was decommissioned, Koenig remained with Norman Osborn’s newly created H.A.M.M.E.R. agency, despite the fact many of his former allies, including Dum Dum Dugan and Gabriel Jones resigned and created the Howling Commandos PMC. It was later revealed that Koenig was secretly working with the Howling Commandos and assisted them with raiding multiple H.A.M.M.E.R. Hellicarriers.
Reunited with his Howling Commandos team mates, Eric took part in raiding a secret Hydra base in . As the team was leaving, several Hydra Dreadnaughts appeared and, in the ensuing battle, both of the Howling Commandos’ Hellicarriers were shot down. Eric and many of his team mates managed to parachute safely to the ground and engaged their enemies on foot. During the battle, Eric is shot in the head and presumed Killed In Action.
Earth-1610: Ultimate Universe
In this world Eric Koening is one of the agents of S.H.I.E.L.D. (number 10) sometimes helping the scientists of shield.
He is one of the agents who died in action.
Earth - 9997
He was killed by Nick Fury.
Agents of S.H.I.E.L.D.
Koenig will make his MCU debut in Agents of S.H.I.E.L.D. portrayed by Patton Oswald. In this version he is a S.H.I.E.L.D. agent.
After the Battle of New York Koenig is stationed in one of Nick Fury's secret bases in Canada, named "Providence". When Phil Coulson and his team arrive Koenig pulls him aside to tell him Fury is still alive. Afterwards he vets each of the other agents giving them all got a badges, by which he is able to track them, when they pass. When Coulson leaves with Tripplette, Fitz, and Simmons to recapture Blackout, Eric gives Skye the go ahead to hack NSA satellites in order to determine what prisoners has escaped from the Fridge. Fearing that his cover might be blown Ward killed Eric and hid the body. However, Skye soon found it using the tracking device in his badge, causing her to conclude that Ward is HYDRA. He is revealed to have a brother named Billy, also played by Patton Oswald, in charge of another secret S.H.I.E.L.D. facility called "Playground."
Marvel Ultimate Alliance (2006)
An agent of S.H.I.E.L.D.
Marvel Ultimate Alliance 2 (2009)
He invent weapon against carnage. But it got off.