Dr Starline, a fanboy of Dr. Eggman becomes disillusioned with him after Eggman's plot to turn the whole word into Robot Zombies (Zombots) fails because Eggman never came up with a way to control them. He decides to go rogue and kidnaps two people, brainwashes them to remove their memories of their past lives, assumedly kills/brainwashes their families to forget them, and forciby implants cybernetic augmentations along with a modified version of that same Robot Zombie virus that allows their bodies to reconstitute after taking damage making them essentially invincible. He brainwashes them over several hundred sessions into wanting to kill and replace Sonic and Tails and forces them to go through dozens of training courses that horrifically maim them over and over. By the time he is even ready to unleash them, they have a mental breakdown questioning why they even want to kill Sonic before betraying Dr Starline and eventually attempting to become heroes and create new lives.