Tracy plays WWII veteran John Macreedy, who lost an arm in Italy and arrives in Black Rock to present a medal to the father of the Japanese-American soldier who died saving his life. Denizens of the town are immediately suspicious of Macreedy, and their mood sours to outright hostility when they learn why he has come, with local boss Reno Smith (Robert Ryan) encouraging his henchmen, Coley (Ernest Borgnine) and Hector (Lee Marvin), to bait Macreedy at every turn. Macreedy soon realizes that Smith and his lackeys are behind the mysterious disappearance of the Japanese farmer, Komoko, but they don't intend to let Macreedy live long enough to tell the state police about their crimes.
Each character in this story represents a possible response to injustice, with Tracy's disabled veteran as our moral example and Ryan's seething racist at the other extreme. Macreedy, wanting to honor the memory of his fallen comrade and perhaps assuage his survivor's guilt, never wavers in his commitment to seeing justice done, even though it could mean his own death. He isn't temperamental or easy to bully into foolish action, which makes him particularly dangerous to the volatile, tyrannical Smith, who recognizes him as the inexorable force of justice personified. Smith puts on a friendly face at first, but it's merely a calculating facade. His need to rule over his neighbors and his vicious hatred of Japanese people soon become obvious. Coley and Hector eagerly abet Smith's reign, if only because it gives them scope to exercise their own sadistic natures and probably line their pockets at the same time. Young Pete (John Ericson) and his sister, Liz (Anne Francis), both express ambivalence at first, but each of them must eventually choose a side, and their starkly different decisions determine their fates. Good intentions and cowardice mark the characters of Doc Velie (Walter Brennan) and Sheriff Tim Horn (Dean Jagger), older men who don't condone Smith's crimes but seem unable to stand up to him until Macreedy shows them how it's done. It's worthwhile to note that Liz is the only female character we see in the entire town until the very last scene, as if Black Rock women have to stay in hiding as long as Smith's gang holds absolute sway. Black Rock is no place for them or children, either, because no one is safe as long as a ruthless tyrant rules the town.
American movies often romanticize small town life, but Bad Day at Black Rock picks up that rock to examine the venomous insects scurrying underneath. Four years before Macreedy's arrival, those insects swarmed out to murder the innocent Komoko just for being Japanese, even as his son fought for their collective freedom overseas. That was a bad day, too, but Black Rock is a place made for bad days, as Macreedy soon discovers. Small towns are prone to group think, susceptible to strong man predators, and often solipsistic in their worldviews, as they have trouble imagining that other places and people exist, much less matter. Macreedy says that he doesn't think there are a lot of towns like Black Rock in America, but the viewer ought to know better. Bad Day at Black Rock recreates World World II and the fight against the Nazi regime in a hot desert microcosm, warning us that cruelty, prejudice, cowardice, and apathy are not just problems "then" or "over there" but also, always, here and now. There's always another Reno Smith and plenty of Hectors and Coleys ready to enforce his will for their own gratification. There are plenty of "stay out of it" types, too, and those who disapprove but only wring their hands because they're afraid of incurring the bully's wrath. In the movie, Macreedy arrives on the train to save the town from itself, like a roving samurai, a lone gunfighter, or even a middle-aged, one-armed superhero, but that's the part of the story we can't depend on in real life. There's no guarantee that the train will ever stop, or that the hero we're waiting for will be on it if it does. If you have to pick a character to be in Bad Day at Black Rock (and you do), be Macreedy, and don't wait for him to be someone else.
Bad Day at Black Rock earned three Oscar nominations, including nods for Sturges and Tracy and a Best Screenplay nomination for Millard Kaufman, who adapted the story from Howard Breslin's 1947 short story, "Bad Time at Honda." Sturges' other films include Gunfight at the O.K. Corral (1957), The Magnificent Seven (1960), and The Great Escape (1963), all of them terrific pictures. For a thematic Spencer Tracy double feature, pair Bad Day at Black Rock with Fury (1936) or Judgment at Nuremberg (1961). Robert Ryan, often cast as a heavy in noir and Western films, also plays a prejudiced killer in Crossfire (1947), but to see him as the good guy catch The Set-Up (1949). Unlike their characters in the film, Robert Ryan, Lee Marvin, and Ernest Borgnine all served in the military during WWII. For more films about the dark side of American small towns, try Kings Row (1942), Storm Warning (1950), or Invasion of the Body Snatchers (1956).