Thunder Mountain, which was directed by Lew Landers, is one of a long line of RKO westerns that were loosely based on Zane Grey novels, including Nevada (1944), Wanderer of the Wasteland (1945), West of the Pecos (1945), Sunset Pass (1946), and Code of the West (1947).
In some cases, a character’s name was all that remained from the source material, and the use of the name “Zane Grey” above the title was just a way to sell the film.
But even when the plots followed Grey’s novels, the RKO westerns based on his books bore little resemblance to Grey’s feverish prose, larger-than-life Romantic heroes, and old-fashioned dime-novel plots. They were straightforward B westerns with straight-shooting heroes, vicious bad guys, comical sidekicks, and beautiful women. They were rarely much longer than an hour, and they were fashioned solely to entertain.
Thunder Mountain, which stars quiet, understated cowboy star Tim Holt (the son of cowboy star Jack Holt and a veteran of World War II — he served in the Army Air Corps as a bombardier), is solidly in this tradition. Its story about greedy land-grabbers and old family feuds is the standard stuff of horse operas, but it’s still a well-made and enjoyable way to spend an hour.
Marvin Hayden (Holt) returns to Grass Valley, and lands smack-dab in the middle of a long-standing feud with the Jorth family. Hayden is the last surviving member of his family, and his romance with the pretty little Ellie Jorth (Martha Hyer) is cut short as soon as they discover each other’s parentage.
Ellie’s brothers, Chick Jorth (Steve Brodie) and Lee Jorth (Robert Clarke), are itching to put Hayden six feet under, but what none of them knows is that the real bad actors in Grass Valley are Trimble Carson (Harry Woods) and his right-hand man Johnny Blue (Tom Keene), who quickly realize how easy it will be to play Hayden against the Jorths.
But like any good western hero, Hayden has a solid group of compadres — the Mexican-Irish Chito Rafferty (Richard Martin), the feisty Irish bar girl Ginger Kelly (Virginia Owen), and the alcoholic and broken-down old lawyer Jim Gardner (Jason Robards Sr.) — not to mention Ellie and her conflicted feelings about Hayden. It’s a foregone conclusion that Hayden will come out on top, just like it’s a foregone conclusion that his vow to never wear a gun will be broken by the end of the picture, but the journey is a fun one, and well worth watching for fans of ’40s B westerns.