One day when watching TV, Homer sees a commercial for a car that dosn't run on gas. The Simpsons take that car for a test drive, only because Homer wants the free gift that comes with the test drive. The gift turns out be tickets to a remake of "Mr. Smith goes to Washington". Everyone says the movie is great, except for Homer. Mel Gibson soon starts to change the movie with the help of Homer's advice. The final movie is a terrible mess, and the producers don't want it to see the light of day. But Mel grabs it and soon it hits theaters.
This was a very funny episode. I loved the Robert Downey Jr joke, Homer and the dog with twitchy eyes, and much more.