Vapor

Vapor is a Marvel Comics character that appeared in The Avengers: Earth's Mightiest Heroes, voiced by Colleen O'Shassguey, and in Avengers Assemble, voiced by Catherine Taber. She is an Hydra scientisat who got exposed to gamma radiation while on a trip to space. The gamma radiation mutated her, turning her into a being of pure gas. She uses her newfound powers to fight the Avengers as a member of the U-Foes. She is brave, headstrong and confident.