The Vanishing Legion
Stars Harry Carey and Edwina Booth were originally intended to be in the studio's previous serial , "King of the Wild" , but had to be re-cast when the MGM film "Trader Horn" ( 1931 ) overran its schedule . 
<triplet> Trader Horn <subj> Harry Carey <obj> cast member <subj> Edwina Booth <obj> cast member