About to finish high school, budding inventor Z.T. dreams of escaping both his sleepy town and his gloomy, widowed Dad, Cole. But his ambitions get a stunning reality check with the arrival of Zack, a raving, 68 year-old drunk claiming to be the boy's older self. Suspiciously unable to recall the exact details, Zack is desperate to avert a single, tiny mistake he claims sent the rest of his years into a tragic spiral. As the two forge a shaky alliance to piece together the old man's fragile mem...