Homer receives a cryptic message to meet someone at a special time and place, and that someone turns out to be his mother.
They reunite, and Homer promises to never let her leave his side again. Eventually, the police catch up to Homer's mother and take her into custody for old crimes.
Homer busts her out of jail by taking control of the prison bus she's traveling in. Finally, she slips away again, but leaves another secret message for Homer to reaffirm her love for him.