Young Hercules - Season 1 Episode 8 Keeping Up with the Jasons
Overview: After Hercules is bested in a practice sword fight by Jason, he asks Hephaestus to build him some new weaponry. Hercules's new sword and shield, are made from a metal that no other metal can harm and this power brings Hercules a lot of trouble and threatens his friendships with Iolaus and Jason.