There are 2 books in the The Atomic Time of Monsters series. The newest book is Tyrantis Roams the Earth! which came out in 2021.

It all begins with the Superquake of 1954, a geological calamity of unprecedented scope. Though this on its own is more than enough to shake humanity to its very core, what follows proves to be all the more terrifying - for soon colossal monsters begin emerging from the newly formed…
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Tyrantis Roams the Earth!

Book cover of Tyrantis Roams the Earth!
When last we saw the likes of Tyrantis, he was sinking beneath the depths of the Pacific Ocean, miles away from the world of men and monsters alike. But you can't keep a good monster down, and the Lord of Leviathans is back for another tale of travel and terror!With…