Dan Vadis (born Constantine Daniel Vafiadis in Shanghai, China 3 January 1938, died 11 June 1987 in Lancaster, California, USA) famous for his lead roles in many Italian films made in the 1960s

Vadis was an actor of Greek descent with lineage tracing back to the infamous island of Chios in the Aegean Sea. This former U.S. Navy sailor and member of the Mae West Muscleman Revue in the late 1950s was a brawny, durable 6'4" man with curly brown hair, bluish green eyes and an affable demeanor.

He was one of many muscle men to take a stab at fame and fortune with the Italian sword and sandal films of the 1960s. Noted film critic Raymond Durgnat famously asked if he was "the brother of Quo?"

His most notable role was "The Triumph of Hercules" (1964), in which Vadis portrayed Hercules battling golden giants and trying to save his princess love from her evil relative. The film was quickly followed by Hercules the Invincible retitled Son of Hercules in the Land of Darkness, in The Sons of Hercules television package by Embassy Pictures.

Helga Liné (born Helga Lina Stern on July 14, 1932) is a German-born Portuguese-Spanish film actress and circus acrobat best known for her work in the horror genre of film. She made 132 appearances mostly in film between 1941 and 2006, but most of her work has been in Spanish cinema.

Helga Line was born as Helga Lina Stern on July 14, 1932, in Berlin, Germany. At a young age her family fled Germany during the Nazi regime and took refuge in Portugal. At the age of just 9 years old she made her first film appearance there in the film Porto de Abrigo. Helga began her career as a dancer and acrobat in circus performances in Portugal throughout the 1940s and later became a model.

In the 1950s she made further appearances in film, but her career took off after she moved to Madrid in 1960. From this point, the red-headed actress made many appearances in the 1960s, particularly in horror films, action or spy thrillers, and westerns. She also starred in Hercules and the Tyrants of Babylon, which was filmed in 1964. Although she appeared in James Bond spoof films such as Agent 077 - Mission Bloody Mary (1965) alongside Ken Clark, she is well noted for her horror film work in particular, starring as the spy Natasha in the Gothic feature Horror Express, in the title role in The Lorelei's Grasp, as a predatory vampire countess in the erotic film The Vampires' Night Orgy, and as the leader of a Satanic cult in the Black Candles. She starred alongside Spanish horror actor Paul Naschy in two notable films: Horror Rises from the Tomb and The Mummy's Revenge.

Louis Jude "Lou" Ferrigno (born November 9, 1951)) is an American actor, fitness trainer/consultant, and retired professional bodybuilder. As a bodybuilder, Ferrigno won an IFBB Mr. America title and two consecutive IFBB Mr. Universe titles, and appeared in the bodybuilding documentary Pumping Iron. As an actor, he is best known for portraying the titular role in the CBS television series The Incredible Hulk and for voicing the character in subsequent animated and computer-generated incarnations. He has also appeared in European-produced fantasy-adventures such as Sinbad of the Seven Seas and Hercules, and as himself in the sitcom The King of Queens and the 2009 comedy I Love You, Man.

Lou Ferrigno was born in Brooklyn, New York to Victoria and Matt Ferrigno, a police lieutenant. He is of Italian descent. Soon after he was born, Ferrigno says he believes he suffered a series of ear infections and lost 75 to 80% of his hearing, though his condition was not diagnosed until he was three years old. Ferrigno started weight training at age 13, citing body builder and Hercules star Steve Reeves as one of his role models. He was also a fan of the Hercules films that starred Reeves—and would later play Hercules as well. Ferrigno's other personal heroes as a child were Spider-Man and the Hulk. Ferrigno attended St. Athanasius Grammar School and Brooklyn Technical High School, where he learned metal working.

Rudolf Zehetgruber (born 16 September 1926) is an Austrian film director, screenwriter, actor and film producer. He directed 17 films between 1960 and 1985.

He was born in Vienna, Austria.

Bradford Harris (born 16 July 1933) is an American actor, stuntman, and executive producer. He appeared in a variety of roles in over 50 films, mostly in European productions. He is a member of the Stuntman's Hall of Fame.

Born in St. Anthony, Idaho, his family moved to California where he attended Burbank High School then received an athletic scholarship to UCLA where he studied economics. When he injured his knee playing football he was advised to take up weight lifting to strengthen the injury that developed his interest in bodybuilding.

Harris entered films as a stand-in, stuntman, and later an actor. His first roles were in André de Toth's Monkey on My Back and Li'l Abner. With his athletic physique, Harris travelled to Rome to watch the 1960 Summer Olympics and perform stunts in Stanley Kubrick's Spartacus. He stayed in Europe for the boom in European sword and sandal, Eurospy, and spaghetti western genres. Harris discovered, when working in Germany, that stunt coordinators were nonexistent in that country and he often did extra duties as a stuntman, stunt coordinator, and second unit director as well as an actor.