Sonic, Manic and Sonia find an abandoned baby in an alley and begin a search for the baby's parents. Manic grows particularly fond of the child and decides that instead of taking the baby to shelter as Sonic and Sonia ordered, that the baby would be more comfortable at the Underground Sanctuary. While Sonia and Sonic are working to uncover another plot of Robotnik they find that the baby is not a baby at all, but an android equipped with cameras to spy on the underground. Sonic and Sonia frantically search for their brother before he unknowingly exposes the location of the secret sanctuary. When he discovers the truth, Manic becomes very depressed and wants revenge against Robotnik!