What character that first appeared in "Marvel Mystery Comics" #13 is said to be married to Scarlet Witch?
Scarlet Witch:  The character has since starred in two self-titled limited series with husband the Vision, and has historically been depicted as a regular team member in superhero title "The Avengers". Vision (Marvel Comics):  The first iteration, created by Joe Simon and Jack Kirby, was an alien who first appeared in "Marvel Mystery Comics" #13 (November 1940).
Vision