Here comes the most anticipated segment for comparison of these two characters i.e. Jean Grey Summers vs Supergirl superpowers. Powers and abilities define their strength, both physical and mental. So what will happen if these two super characters engage in a fight? Here you can compare Jean Grey Summers vs Supergirl powers, abilities, weapons and gadgets. So lets check out Jean Grey Summers Powers and Supergirl Powers.Decide who is more powerful!