Mar-Vell was introduced to the comics in 1967's Marvel Super-Heroes \#12. Shortly after the Kree first encountered humanity, he was sent to Earth as a spy, and he took the identity of the recently deceased Dr. Walter Lawson (no word yet on if that guise will be used in Captain Marvel). However, as Mar-Vell started protecting the people of Earth, he grew attached to them, to the point that he was eventually charged with treason by the Kree Empire. From that point forward, he fully became a cosmic superhero for all, and later on he used the Nega-Bands to provide him with more abilities. Sadly, Mar-Vell died from cancer that came from exposure to a nerve gas years earlier.