Death Battle Ideas

Ant-Man vs The Atom

Marvel Comics vs DC Comics

Connection:

Both are scientific geniuses (Henry "Hank" Pym and Raymond "Ray" Palmer) who are superheroes who have the power to change their size at will, capable of shrinking from a microscopic level to a giant

Both are members of a superhero team (The Avengers to Hank and Justice League to Ray)

Both eventually passed their titles down to their successors (Scott Lang became the second Ant-Man and Ryan Choi became the second Atom)