Hercules was to get rid of the Cretan Bull. The bull haunted the labyrinth of King Minos. He was half man half bull and blew flames. Hercules had the bull beat and shipped him back to the mainland.
Labor 8: Mares of Diomedes
Hercules had to bring Eurystheus the mares of Diomedes. They were horses that ate the flesh of travellers who wrongfully chose to accept Diomede's hospitality. One version of the myth says Hercules calmed them by feeding them their master while another version says they ate Hercule's Squire, Abderus. Hercules got them all together and moved them to the sea, where he shipped them for Tiryns
Labor 9: Hippolyte's Belt
Hercules had to get the queen of the Amazons belt for Eurystheus' daughter. The amazons are a race of warrior women and archers. Hercules got a bunch of heroes together to help him. Hippolyte willingly gave the belt to Hercules. Hera was not satisfied and started a rumor that the Greeks had captured their queen. This caused a battle, but Hercules got the belt and Theseus kidnapped an Amazon princess.
Labor 10: Cattle of Geryon
Hercules had to steal cattle from Geryon, who had three heads and three bodies from the waist down. As Hercules was leaving with the cattle, Geryon's two headed watchdog ran at Hercules. Hercules killed the beast with one hit with a wooden club.
Labor 11: Apples of Hesperides
Hercules had to obtain the apples of Hesperides which were contained in a grove that was surrounded by a huge wall and guarded by a many-headed dragon. Hercules could not get the apples without help from Atlas. He killed the dragon by shooting an arrow over the wall and then let Atlas capture the apples. Hercules had to hold Atlas' pillar while this was happening and tricked Atlas into taking it back.
Labor 12: Capture of Cerberus
Hercules had to capture the hellhound Cerberus from Hades. Hercules had to cross the River of the Underworld, the Styx River, to get to the hellhound. Cerberus had razor teeth, 3 or 50 heads, and a bundle of snakes growing out of his back. The back snakes lashed at Hercules and Cerberus went for his throat. Luckily, Hercules was wearing his lion skin that could not be pierced. Hercules then choked the hellhound to failure and dragged him back to the Tiryns.