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When both John Wayne and Ray "Crash" Corrigan defected from Republic's "Three Mesquiteers" series, the studio hastily replaced them with Robert Livingston (whom Wayne had originally replaced) and future "Cisco Kid" Duncan Renaldo. In Kansas Terrors, Stoney (Livingston) and his saddle pal Rusty (Raymond Hatton) take a job delivering horses to a flyspeck Caribbean island. Here they join forces with Rico (Renaldo) to topple the regime of a despotic commandante (George Douglas). Despite the fact that Rico was introduced as a horse thief, he becomes fast friends with Stoney and Rusty, and by film's end has agreed to return with them to the US, so that there'll be three Mesquiteers once more. After two years' worth of the Livingston-Renaldo-Hatton team, Republic would come up with yet another winning combination, consisting of Livingston, Bob Steele and Rufe Davis.