Endless Winter chapter four! The icy tendrils of Frost King's global grip extend all the way to the bottom of the Seven Seas! Can Arthur and Mera convince a ferocious collective of Fire Trolls to emerge from the Earth's very core to save Atlantis from its frozen imprisonment? And in our look to the past, the unlikely team of heroes gets more than they bargained for when they face off against the Frost King for the very first time!