Harry Morgan plays an elderly man with a Rube Goldberg machine filling his apartment. His daughter is concerned and arranges for a social worker to look in on him. It turns out that the machine is an allegory for the world. Harry is constantly making modifications and additions to the machine to keep the world running right.
To the chagrin of his wife Cindy, fading baseball star Ed Hamler sees an uncanny resemblance between himself and Monty Hanks, a fellow baseball player who has the same stats as Ed but lived 78 years ago.