 Mar-Vell became a close ally of the Titans, and one of their number, Elysius, became his lover.His career was cut short when he developed inoperable cancer, the result of an earlier exposure to toxic nerve gas during a battle with Nitro.He died from this cancer on Titan in the presence of the Marvel Universe's superhero community, as chronicled in Marvel's first large-format graphic novel, "The Death of Captain Marvel", published in 1982.