Demon Headmaster

Well it could start off. If we remember In Hyperbrain series, Hypberbrain seemed to be destroyed. Well there is a scene showing Mrs. Hunter being given the information back, you could have it that Hyperbrain saved inself in her memory and when all the information was being put back into Mrs. Hunter, Hyperbrain also did. She is in Mrs. Hunters mind and tries to take over, after struggles, she is successful and plans to take all the knowledge in the world it is up to Dinah Hunter and Co. to save the day.