Iron Man: Viva Las Vegas #2

With the aid of archaeologist Elsa Bloodstone, Tony Stark has discovered the cause of the plague of reptiles that's crippled the Las Vegas strip! Unfortunately for his armored alter ego, that something is ""He Whose Limbs Shatter Mountains, And Whose Back Scrapes The Sun""--Fin Fang Foom!

Image: Iron Man: Viva Las Vegas #2 - Marvel Comics

Iron Man: Viva Las Vegas #2