Grim Jr. and Grievous first met Mimi in the Underworld
where she was as flesh and blood. They encountered Jeff the Spider and went along with him. In Jeff's cave Grim Jr. told his story and suddenly they encountered Minniemandy. Jeff sprayed Redeemer and Junior to the wall with his web and turned the girl into Mimi. While Him talked to Grim Jr., Mimi was guarding Redeemer.