Mona Simpson, mother of Homer J. Simpson and estranged wife of Abraham Simpson, was thought to be dead until it was discovered that she has been on the run from the law due to an encounter with power plant owner Charles Montgomery Burns many years ago. While Homer was still a small child in the 1960s, Mona became increasingly caught up in the hippie movement and participated in various acts of political activism. On one of these acts, Mona and a gang of other activists protesting germ research entered Burns's laboratory and destroyed all the biological warfare experiments. As the gang escaped, she stayed behind to help a fallen Burns -- who repaid her kindness with a threat. Since that night, Mona was forced to leave her family.
While Mona's whereabouts were unknown for most of her life, it is known that for several years she resided at a hippie commune where she painted a mural dedicated to her son Homer. She continued to care for him from afar, sending him care packages every week. However, none of them have been delivered, and have instead been stored at the post office for years.
When Homer fakes his own death in Mother Simpson, Mona hears the news and visits her son's open grave, into which Homer had just accidentally fallen. They are reunited, and Mona spends some quality time catching up with her family, but when Burns sees her at the post office and recognizes her face, she is forced to go on the run again.
Voiced by: Glenn Close
See: Characters from The Simpsons
