Mar-Vell is a fictional superhero appearing in comic books published by Marvel Comics. Created by writer Roy Thomas and artist Gene Colan, he first appeared in "Marvel Super-Heroes" #13 in 1967. Mar-Vell is a member of the Kree, an advanced alien race, and is known for his superhuman abilities, including strength, flight, and energy manipulation. As a character, Mar-Vell often struggles with his identity and loyalty between his home planet and Earth. He has been a key figure in various storylines, including his role in the Infinity Saga and his connection to Carol Danvers, who later becomes the superhero Captain Marvel.