The First Wave
Dr Gero - Intelligent engineer of Red Ribbon. He developed a hatred towards Gokou because Gokou destroyed Red Ribbon. He is the creator of Androids 8, 13, 14, 15, 16, 17, 18, 19, and 21, and makes himself into Android 20. He was betrayed and killed by Android 17. But, he allies with Dr. Myuu in hell to create Artificial 17 and escapes to Earth, where he was betrayed and killed by Super 17 upon Dr. Myuu's orders.
Android 19 - The first Android to arrive on Earth, Android 19 is a clever, overweight warrior with a love for exotic weapons. Android 19 has the ability to absorb energy from his opponents, but was quickly killed by Vegeta.