Sergeant Metallic, also known as Major Metallitron in the English dub, is a robotic member of the Red Ribbon Army, working under General White. He resembles Arnold Schwarzenegger's Terminator role. When Son Goku first entered the Muscle Tower, in search of one of the Dragon Balls and to save the mayor of the village near the tower, he was greeted by Metallic, who was expecting him and challenged him to a battle. During the fight, Goku is unable to inflict damage on him, so he uses a Kamehameha, which makes Metallic's head fall off, but the robot continues attacking Goku. When Goku is about to finish him off, Metallic simply stops moving, because his batteries emptied during the fight. So, Goku simply leaves him and continue climbing the tower.
Sergeant Metallic briefly returned in Dragon Ball GT, who escaped from Hell along with the other villains from the past. He was quickly destroyed by Pan and was sent back to Hell.
Metallic also appeared as a boss character in the video game Dragon Ball: Revenge of King Piccolo.