Introduced as a formidable operative of the Secret Empire, Seraph led a mission to kidnap the Vision in Defenders #123. Yet in a surprising turn of events, Seraph then helped the Defenders defeat the Secret Empire in #129-130. Here, Seraph revealed herself to be a Soviet agent who had infiltrated the Secret Empire to thwart the criminal organization's plot to manipulate the United States and Soviet Union into starting the next world war.
While undercover, however, Seraph had used her psionic powers to give Cloud false memories that the Secret Empire had killed her parents, turning Cloud's loyalty away from the Secret Empire and to the side of the Defenders. Cloud's complicated true past remained unknown until #149-150.