Zerktro is RetroSpecter's larger and more monstrous second form. He has bright green crystals all over his body. These crystals can be used to attack but are also solid enough to act like armor in some scenarios, and they also glow in the dark. The hair on his head and neck grow even longer, all the way down to his back. His tail also extends out a lot more and is much heavier, which can be used as a blunt weapon for crushing.