Final answer:
Walter Mitty faces a heroic and tragic end in his final fantasy, showcasing his desire for adventure and resistance against the mundane reality of his life.
Step-by-step explanation:
In the final fantasy of The Secret Life of Walter Mitty, Walter Mitty faces the prospect of a heroic and tragic end. Engaged in a fantasized battle against overwhelming odds, he endures as an emblem of resistance and bravery. This final daydream contrasts with his mundane and controlled real-life experiences, representing his desires for adventure and autonomy that he cannot attain in his ordinary life.