The Titans and the Giants:

Titanomachia unleashed and harbingers of Ragnarök!

Now, there is a twist to the story of the previous entry: the titans of Greek mythology were to eventually break free from Tartarus, and wreak havoc upon the worlds of men and gods alike. When this time came, the gods of Olympus —led by Zeus— would go to war against the enraged assailants...

This was a “titanic clash” known myth-wise as “Titanomachia,” and though the gods are victorious —and still alive!— afterwards, they decide to distance themselves from humans, and leave them to their own devices…

Well, a similar account we hear from the Norse: the giants, in a surprise-move, are to come forth from Jottunheim, cross the bridge into the realm of the gods, and lay waste to both Asgard and Midgard. This last one —home to mankind— was also called “Middle-earth,” because it was thought to stand in the middle of all the Nine Realms...

This cataclysmic event, called “Ragnarök,” would be the great conflict at the end of the world between the Asgardians and the rampaging giants. They mostly succeed however; the battle goes ill and many benevolent gods are killed before this “gigantic” uprising is finally quelled. The list of casualties includes Odin (eaten by Fenrir), Thor (poisoned by Jormungandr), and Heimdall (stabbed by Loki).

An bleak aftermath-version of the world is rebuilt by humanity, which henceforth drifts further and further away from the affairs of Asgard —albeit, free from fear of giants assailing them...

In the end, both these tales are rather different from what Jesus revealed to Christians. Giants —and by extent, titans their cousins— did exist according to the Bible; they were called “Nephilim,” the devilish spawn of (fallen) angels and human women. These, however, simply diminished and went extinct long ago, although not before settling in Canaan; Goliath and the Philistines were indeed of the lineage of this unholy breed, doomed to be overthrown and eradicated by a slinger-boy who would thereafter be known by a heroic name: King David, Founder of Jerusalem, the City of Man.

Instead, the rather factual final battle of the Day of the Lord, called “Apocalypse” (or, epoch-break) by some, “Armageddon” (or, Mount Megiddo, a real-world location) by others, will be something else entirely. The final confrontation of the already-defeated enemy and his demons against the full might of the Eternal and Everlasting God, coming in the Glory of Jesus the Messiah, King of kings and Lord of lords. A glorious day indeed, it will mark the establishment of the Kingdom of Heaven for mankind, the end of the ages, and the lifting and "rapture" of the church to dwell in the places beforehand prepared for us all... For more information, read the Book of Revelations, generally accredited to John the Apostle.