Rex Mason (Earth-1955)

"Y'know, being turned into my base chemical components by my girl's dad should have prepared me for days like this."

- - Metamorpho to Spider-Man

Rex Mason is a former member of the United States Marine Corps, where he befriended John Stewart. He eventually started dating Sapphire Stagg, daughter of the billionaire Simon Stagg, the latter who turned him into the morphing Metamorpho.