powered by AFI
While the onscreen credits list the dog Gray Shadow as playing himself, he is named "Brutus" within the film. According to Hollywood Reporter, Gray Shadow was the great-grandson of the canine silent film star Strongheart. According to modern sources, Universal had originally sought actor Claude Rains, who had portrayed "Jack Griffin" in their 1931 film The Invisible Man, for the starring role of "Robert Griffin." When the actor turned down the role, Universal contract player Jon Hall was cast. Though better known for his adventure films with actress Maria Montez, Hall had also starred in the previous "Invisible Man" film at Universal, 1942's Invisible Agent (see entry above). Modern sources add Olaf Hytten (Grey) and Beatrice Roberts to the cast and credit Maury Gertsman as camera operator and Eddie Keyes as property master. For additional information on the series, please consult the Series Index and see the entry for The Invisible Man (AFI Catalog of Feature Films, 1931-40; F3.2148).