Homer's mom dies, and as part of her will, she asks him to spread her ashes. However, her request turns out to be part of her final act of rebellion against the system.
Homer's mother returns, saying her activism days are over but Homer is still mad at her for putting her causes above his upbringing. When she passes away he feels mean and agrees to spread her ashes from the mountain top in the national park - where they can gum up the works of the adjacent missile launcher due to fly nuclear waste into the rain forests, just as Mother Simpson had planned. Homer gets captured but the gifts his mother left the other family members help him escape in true Bond style.—don @ minifie-1