liaison to defense industry contractor Tony Stark beginning in the "Iron Man" feature in Tales of Suspense #93 (September 1967), and continuing into that subsequent series as well.

Sitwell afterward appeared in a three-issue arc of the superhero-team series The Avengers in 2000, and in Punisher War Journal (vol.

However, Sitwell soon proves himself and earns his fellow agents' respect — albeit tinged with occasional humor aimed at his youthfulness and idealistic naïveté.

[2] It's there he confronts costumed assassins and terrorists, such as Grey Gargoyle, Spymaster (who shoots him and puts Sitwell in a coma for a time),[3] and A.I.M.

When Obadiah Stane takes over what was by then named Stark International, Fury sends Sitwell on an ultimately failed attempt to retrieve Iron Man's armors.

leadership at the time, is seemingly killed by a self-aware, renegade "Deltan" variety of the artificial human "Life Model Decoys" of S.H.I.E.L.D., and replaced by one such LMD which was then installed as executive director.

[6] The real Sitwell later turns up alive after having been brainwashed by a faction of the terrorist organization HYDRA, placed in suspended animation, released as part of a plot against Fury, and eventually deprogrammed.

He would join with Dugan to form a mercenary paramilitary group that would engage H.A.M.M.E.R., HYDRA and its associate "Leviathan" program, alongside Fury's Secret Warriors.

Jasper Sitwell appears in media set in the Marvel Cinematic Universe, portrayed by Maximiliano Hernández.