Conversation so far:
What is the plot about?
Lisa wakes up Bart to remind him that her birthday is nearing, and that he forgets it every year.
Bart promises to get her a present this year.
Are there any other interesting aspects about this article?
Meanwhile, Homer discovers that all of his white shirts have turned pink because Bart put his red hat in with the laundry.
Was marge mentioned at all in this episode?
Marge, upon hearing what has happened, comes to the institution and is able to convince Homer's doctors that he is not insane.
Was any of Barts friends mentioned in the plot?
Bart tells his friend Milhouse and soon all of Springfield turns up outside of the Simpson family's home to see Michael.
What happens to Homer?
Homer bids farewell to Michael, who reveals that he is in the mental institution voluntarily.
Homer decides to let him stay in the family home.
Does Marge rescue her husband, Homer?
The level of excitement is deflated when Homer introduces Michael and they realize he is an impostor.
Does Marge do anything in the plot?
Marge, upon hearing what has happened, comes to the institution and is able to convince Homer's doctors that he is not insane.

Question: Anything else you can tell me about the plot?
Self-contained rewrite: Other than the plot, what else can you tell me about Stark Raving Dad?