Hercules Trailer: The Four Monsters

The first trailer for "Hercules," starring Dwayne "The Rock" Johnson, has been released online. The trailer features the Greek demigod battling several mythical creatures. For those of you not up on your ancient Greek mythology, we've compiled this article to let you know who, exactly, those horrible creatures in the trailer were. The Nemean Lion The Nemean lion was a ferocious beast. Its fur was impervious to attack, making it impossible to for mortals to kill, and its claws were sharp enough to cut through any man's armor. The creature could also turn himself into a damsel, luring heroes into his cave so that he could catch them off guard. Slaying the Nemean lion was the first of Hercules' twelve trials.

The Lernean Hydra was an aquatic, nine-headed reptilian beast with poisonous blood and breath. When you cut off one head, two more would grow in its place. The beast was created by Hera specifically to slay Hercules. Hercules killed it as his second trial, and would use the creature's poison blood to aid him in his future battles.

Hercules' fourth trial was to capture the Erymanthian boar. The boar was a gigantic, a monstrous, twisted and rage-filled version of an animal. The boar is sometimes said to have been used in the vengeful plots of the petty gods.

Cerberus The final of Hercules' twelve trials was the capture of Cerberus, the three-headed hellhound, without the use of any weapons. The creature guarded the entrance to Hades' domain, the Underworld. This is the most difficult and dangerous of Hercules' trials, and he is forced to make a deal with Hades himself in order to complete it. "Hercules" comes to theaters July 25, 2014.