Four of the Apocalypse is a 1975 Italian spaghetti Western film directed by Lucio Fulci and starring Fabio Testi, Tomas Milian, Lynne Frederick and Michael J. Pollard.

Fabio Testi is an Italian actor. After growing up witnessing film work done around Lake Garda, Testi entered the sets of the film and began work as a stuntman and a double on set, where he worked as a stuntman on The Good, the Bad and the Ugly. Testi continued stunt work and getting roles in low budget genre films until he was cast in Vittorio De Sica's film The Garden of the Finzi-Continis. Following this film, Testi became a star in Italy, appearing in some artistic films by Giuseppe Patroni Griffi and Claude Chabrol. Testi also continued to work in poliziotteschi genre films in the 1970s as well as a few gialli, and gained infamy for his publicised relationships with actresses Ursula Andress and Charlotte Rampling.