Apollo

Apollo is the leader of the Constellation Droids who came to Earth seeking technology to bring back floral life to their planets. When Apollo and his group arrive on Earth, the first person they meet is Dr. Wily. He tells Wily what they are seeking, but Wily manages to use a device to take control of Apollo and his followers, and uses their own technology to poison the plant life of Earth. Wily wants to blackmail the world's governments to get them to pay for him to stop doing so.

Dr. Light sends Mega Man, Auto, Eddie and Beat to investigate the situation and take down the Droids, and once they are defeated, they confront Apollo. Apollo informs them of the real situation after they bring him back to his senses, and they all go after Dr. Wily, putting an end to his scheme.

In the end, Dr. Light manages to construct a device that returns the atmosphere to its original state, restoring Earth's plant life, and gives a replica of the device to the Constellation Droids to take with them to their home planets.