There's a reason Godzilla, Rodan, Mothra, and Hedorah gathered in ancient Rome There's a reason the Sons of Giants have convened There's a reason Lewis and Clark were sent on their expedition in the first place and it all comes down to King Ghidorah. Well, King Ghidorah and one final dark, terrible secret Witness the ancient origins of King Ghidorah, harkening back to Rome and a battle with Hercules, in the explosive finale of Sons of Giants!