Greek underworld his duty was to bring these souls to the underworld and no one would persuade him to do otherwise. Cerberus (Kerberos), or the "Hell-Hound", is Hades' massive multi-headed (usually three-headed) dog with some descriptions stating that it also has a snake-headed tail and snake heads on its back and as its mane. Born from Echidna and Typhon, Cerberus guards the gate that serves as the entrance of the underworld. Cerberus' duty is to prevent dead people from leaving the underworld. Heracles once borrowed Cerberus as the final part of the Labours of Heracles. Orpheus once soothed it to sleep with
Ghidorah, the Three-Headed Monster Yoshio Tsuchiya was originally attached to play Malmess but scheduling conflicts prevented him from participating. After the success of previous films where monsters were partnered up such as "King Kong vs. Godzilla" and "Mothra vs. Godzilla", producer Tomoyuki Tanaka decided to develop a film which would feature Godzilla, Rodan and Mothra. The film also includes a new monster, King Ghidorah. Ghidorah's design owes much to Japanese mythology. In 1959, producer Tanaka developed a film that retold the legendary stories of Japan. These included the tale of "Yamata no Orochi", an eight-headed dragon. King Ghidorah is based on Tsuburaya's design for