- Country: Hong Kong, Philippines
- Genres: Action
- Release: 1974-09-18
- Director: Cesar Gallardo , Jun Gallardo
- Writers: Oden L. Amurao , Bobby A. Suarez
- Language: Tagalog | Filipino
- Stars: Christopher Mitchum , Von Serna , Larry Chiu , Romeo Rivera , Cesar Ramirez , Joseph Zucchero , Vic Silayan , Pol Salcedo , Ken Metcalfe , Rosemarie Gil
- Runtime: 91 min
- Awards: N/A
- AKA: Master Samurai (Hong Kong) , Die 3 Unerbittlichen , Los invencibles del kárate (Spain) , Master Samurai , Samurai Dehset Saçiyor (Turkey) , Syndikat der Gnadenlosen , Master Samurai (United States of America) , Los invencibles del karate (Colombia) , Os Magníficos do Karaté (Portugal, Portuguese Republic) , The Agency , Commander Firefox , Commander Firefox (Germany)
- Plot:
In 1909 Arizona, retired lawman Sam Burgade's life is thrown upside-down when his old enemy Zach Provo and six other convicts escape a chain-gang in the Yuma Territorial Prison and come gunning for Burgade. Bigfoot kidnaps some women and some bikers decide to go on a rescue mission to save them.
- IMDB:tt0071820
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