Captain Marvel/Spectrum (1982)
Monica Rambeau was a lieutenant in the New Orleans police force. While trying to prevent the creation of a dangerous weapon, Rambeau is exposed to extra-dimensional energy and as a result she can transmute her body to energy and back again at will.
Rambeau, now known as Captain Marvel, can transform herself into any form of energy within the electromagnetic spectrum including cosmic rays, gamma rays, X-rays, ultraviolet radiation, visible light and electricity. She is invisible and intangible in many of her energy forms, she also has the ability to project these energies from her body while she is in human form, usually in the form of energy blasts from her hands.
Starting in September 2013, Rambeau will appear as one of the lead characters in the Marvel NOW! relaunch of Mighty Avengers comics, acting as the team’s field leader under the new codename Spectrum.