However, Agents of S.H.I.E.L.D. managed to bring the actor back by having him portray Eric’s quadruplet brothers, Billy, Sam, and Thurston.
Oswalt hasn’t returned as a Koenig brother since Season 4, so his return will be most welcomed.
The latter was the only brother who wasn’t loyal to S.H.I.E.L.D., as he was bitter that the agency was responsible for Eric’s death.
Patton Oswalt first appeared on the ABC series in Season 1 as Eric Koenig, a trusted and upbeat S.H.I.E.L.D. agent whose death revealed Agent Ward’s true motives as a sleeper HYDRA operative.