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The film follows Walter Mitty, a timid negative-asset manager at Life magazine who leads a monotonous existence. To escape his "humdrum" life, he frequently "zones out" into vivid, heroic daydreams where he is brave, romantic, and confident.
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His world changes when the magazine prepares for its final print issue. A critical negative—intended for the cover—goes missing, sent by legendary photographer Sean O'Connell (played by Sean Penn). Facing unemployment and the need to find the photo, Walter finally leaves his comfort zone, embarking on a global quest through Greenland, Iceland, and the Himalayas.