Margaret Elizabeth "Peggy" Carter was a British officer representing the Strategic Scientific Reserve and Steve Rogers's World War II ally. After the war, Agent Carter secretly assisted Howard Stark, who found himself framed for supplying deadly weapons on the black market. She was assisted by Stark's butler Edwin Jarvis. They found those responsible and disposed of the weapons which led to the mysterious organization Leviathan. Peggy, along with Howard, founded S.H.I.E.L.D. with Colonel Chester Phillips.