Agent Baker was a Skrull spy sent to Earth and infiltrated the FBI as a precursor to a larger Skrull invasion of Earth that was still years away in the making. The details of this infiltration are unexplained at this time. When he first surfaced, he was already under deep cover as the FBI's "Agent Baker". The Skrull's cover was so deep. He earned a reputation within the FBI as being resident expert on unexplained phenomenon and was the only man within the Bureau who investigated such cases. When he later gave a lecture on the benefits of mutants in society, he attracted the attention of leading expect Charles Xavier, secretly the leader of the mutant group known as the X-Men. Meeting with Xavier, Agent Baker revealed that he knew that Xavier was secretly a telepath. Despite the fact that Xavier had trouble reading Baker's mind, he took the FBI agent into confidence regarding his secret, his connection with the X-Men, and their operations. For a brief period, Agent Baker supplanted Agent Fred Duncan who had been FBI liaison to Xavier for years.