William "Rocky" Rockwell was an FBI agent who served as the leader of the Rocketeers - an elite 24-member group of space pilots that were originally assembled for the first American mission to the Moon. Shortly after he became an agent, he and his best friend, Simpson "Simpy" Smith, were assigned to protect Dr Frank Liebert, an American rocket scientist who invented the original rockets for the above-mentioned moon mission. During the course of his assignment, Rocky distinguished himself when he discovered that Senator Jaynes' secretary was a foreign spy who was trying to discredit Dr Liebert and steal a copy his moon rocket blueprints. Although the spy escaped, Dr. Liebert was impressed with the young FBI agent, and Rocky and Simpy were allowed to continue to serve as his bodyguards.