Mar-Vell is a Marvel Comics character that appeared in The Avengers: Earth's Mightiest Heroes, voiced by Roger Craig Smith, and will appear in Captain Marvel. He is a Kree scientist who arrived on Earth to study a genetic anomaly. There, he fell in love with Earth, and vowed to become its protector. A freak accident caused his powers to transfer into Carol Danvers. When the rest of Kree invaded Earth, he fought alongside the Avengers to protect the Earth from the Kree, and in the end he became king of the Kree, and decided to use his power to reform the Kree into a more peaceful race.
He has super-strength, super-speed, the ability to fly, the ability to fire energy beams and the ability to control the electromagnetic field.
Mar-Vell was created by Stan Lee and Gene Colan.