Homer fakes his own death, and in the process, meets his mother, whom he thought was dead all this time. It turns out she was a 60's radical, who had to go on the lam to avoid being arrested. In the end, she again needs to leave Homer because otherwise she will go to jail.
A good episode, has a good story, laughs, and the end is easily one of the best moments in all of Simpson's history. Definitely one of season 7's bests, if not the best from the season, this episode gets an A+ from me. Perfect episode