- HD 1080
- Runtime: 220m.
- Status: Released
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- Languages: en
- Country: United States of America
- Director: B. Reeves Eason, Ford Beebe
- Stars: Harry Carey, Edwina Booth, William Desmond, Frankie Darro, Philo McCullough
- keywords: secret identity, movie serial
- Production_studio: Mascot Pictures
- The The Vanishing Legion is featured in the top rankings of 1931
- #1 in Top Action Movies of 1931
- #1 in Top Crime Movies of 1931
- #1 in Top Mystery Movies of 1931
- #1 in Top Western Movies of 1931
A mysterious master criminal known as The Voice plots with his gang to sabotage the Milesburg Oil Company, but the rightful heir has a secret army of her own to protect her rights.