The "Earth-TRN258" used on this page is an unofficial Temporary Reality Number that was assigned by our wiki until an official designation is provided by Marvel.
History
A Captain of the Kree army, Mar-Vell received radiation treatment in order to become powerful enough to combat the super powered individuals of Earth. Once on Earth, Mar-Vell turned on his fellow Kree in order to protect Earth and became known as the super hero Captain Marvel.[1]