He may be small, but this living amplifier packs some serious power. Echo Echo produces steel-shattering sonic waves.

Echo Echo is a small gray alien called a Sonorosian from the planet Sonorosia whose body is a living amplifier. He can scream at ultrasonic frequencies capable of overloading machinery and stopping projectiles in mid-flight. He also has the ability to duplicate himself, not unlike Ditto, but different in that the clones aren't linked in any way. By combining these two aspects, Ben can create the "Wall of Sound", wherein he and his clones can redirect projectiles back to their source by bouncing them off of strategically placed clones.