Tired of constantly having nightmares, Nobita ask for Doraemon to bring a Dream Machine which would allow Nobita to dream of anything he wants. After an attempt to have a dream about the fall of Atlantis fails, he chooses a dream where he is in a fantasy world with an inspiration from The Three Musketeers. Together Nobita and his friends must defeat the evil King before he escapes from Nobita's dream into other people's dreams.