Soundwave/Soundscream was a second generation Spaceknight whose main power was his sonic scream. He was guarding the Hall of Science when human rebels ambushed him. He was stunned by an Angel Elite attack but managed to use his scream to kill the last three Angels. He was then killed by Ariane, the rebels leader. His scream alerted other Spaceknights nearby.

Hall of Science when Galadorian guerrillas staged a sneak attack. He was stunned by an Angel Elite attack, but managed to use his sonic scream to kill the last three Angel Elite in response. He was subsequently killed by human's leader, Ariane, using one of Lightningbolt's bolts, but his cry summoned the rest of the rogue Spaceknights.