Mrs. Stella Carter is Lisa's adopted abusive mother and the true main antagonist of Tom and Jerry but she reformed.
Stella is born to Ms. Jennings and Charles Fitzgerald. She is good to Alex and Maddie. One day, when Linda, Alex and Maddie's mom learns that Charles falls in love to her mother (because Linda and Charles just separated two years), Linda kills her mother by falling her to the stairs. She swore revenge on them and kidnapps Lisa and kills Aimee.
She has a mental disorder that allows her to become X.