When the "Hercules" film craze hit in 1959, Italian filmmakers were looking for other muscleman characters similar to Hercules whom they could exploit, resulting in the nine-film Ursus series listed below. Ursus was referred to as a "Son of Hercules" in two of the films when they were dubbed in English (in an attempt to cash in on the then-popular "Hercules" craze), although in the original Italian films, Ursus had no connection to Hercules whatsoever. In the English-dubbed version of one Ursus film (retitled "Hercules, Prisoner of Evil"), Ursus was actually referred to throughout the entire film as "Hercules".