The Simpsons - 22x21 - 500 Keys

    After Maggie locks herself in the car, the family goes through a drawer filled with keys.  They each have a separate adventure.  Homer winds up piloting the Duff blimp.  Marge chases down a toy that wanders around town.  And Lisa finds a key to a strange room in the basement of the school.
    Another solidly good episode from the 22nd season.  Even Marge's storyline is fun, in a strange way.  Homer is plenty entertaining.  And Lisa's story is engaging, and really pretty good.  The only complaint I have is that her story seems like it should take up more than a single day.
    There are a few good gags with Chief Wiggum too, riding a blimp, as well as being unable to pick up things on the ground.