Boom Town is a 1940 American adventure film starring Clark Gable, Spencer Tracy, Claudette Colbert, and Hedy Lamarr and directed by Jack Conway. The supporting cast includes Frank Morgan, Lionel Atwill, and Chill Wills. A story written by James Edward Grant in Cosmopolitan magazine entitled "A Lady Comes to Burkburnett" provided the inspiration for the film. The film was produced and released by Metro-Goldwyn-Mayer.
"Big John" McMasters (Clark Gable) and "Square John" Sand (Spencer Tracy) are two down-on-their-luck oil wildcatters who join forces. Without enough money, they steal drilling equipment from a skeptical Luther Aldrich (Frank Morgan). Their well proves a bust and they have to hastily depart when Aldrich shows up with the sheriff to take back his property. The two oilmen team up and make enough money to partially pay Aldrich. To get him to back them for a second try, they cut him in for a percentage of the well. This time, they strike it rich.
When Elizabeth 'Betsy' Bartlett (Claudette Colbert) shows up, McMasters sweeps her off her feet (without knowing that Sand considers her his girl) and marries her. Sand accepts the situation, wanting Betsy to be happy. However, on their first anniversary, she catches her husband dancing with a barroom floozy. As a result, Sand quarrels with McMasters and they flip a coin for the entire oilfield. Betsy leaves too, but returns when she learns that her husband has lost almost everything to Sand and needs her.
Each man goes through booms and busts. Building on his renewed success as a wildcatter, McMasters moves to New York to expand into refineries and distribution, competing against former customer Harry Compton (Lionel Atwill). Seeking inside information about his rivals, he hires away Compton's adviser Karen Vanmeer (Hedy Lamarr), who uses her social contacts and womanly charms to gather industry information.
Meanwhile, Sand loses everything he has built up in South America to a revolution. When he meets McMasters at an oilmen's convention, the two finally reconcile, and Sand goes to work for his old friend. When he suspects that McMasters is carrying on an affair with Karen, he tries to save Betsy's marriage by offering to marry Karen. However, she deduces his motives and declines. When a miserable Betsy tries to commit suicide by taking sleeping pills, Sand decides that the only way to help her is to bankrupt McMasters. Sand loses his costly battle with his former friend and goes broke. It is only when he asks McMasters to give his wife a divorce that the married man finally comes to his senses. Later, McMasters is prosecuted by the government for violating the Sherman Antitrust Act and loses his business. In the end, poor, but happier, Sand and McMasters team up again, with the blissful Betsy looking on. Aldrich supplies them with equipment and the whole cycle begins again.
- Clark Gable as "Big John" McMasters
- Spencer Tracy as "Square John" Sand
- Claudette Colbert as Betsy Bartlett McMasters
- Hedy Lamarr as Karen Vanmeer
- Frank Morgan as Luther Aldrich
- Lionel Atwill as Harry Compton
- Chill Wills as Deputy Harmony Jones
- Marion Martin as Whitey
- Minna Gombell as Evie
- Joe Yule as Ed Murphy
- Horace Murphy as Tom Murphy
- Roy Gordon as "Mac" McCreery
- Richard Lane as Assistant District Attorney
- Casey Johnson as Jack McMasters as a child
- Baby Quintanilla as Jack McMasters as a baby