Eric Koenig is a fictional character appearing in American comic books published by Marvel Comics. He first appeared in Sgt. Fury and his Howling Commandos #27 (February 1966) and he was created by writer Stan Lee and artist Dick Ayers. He is most commonly in association with the Howling Commandos and S.H.I.E.L.D. Patton Oswalt portrayed the character in the first season of the TV series Agents of S.H.I.E.L.D.. After Koenig is killed, Oswalt continued to portray his identical brothers Billy, Sam, and Thurston and grandfather Ernest throughout the remaining seasons.