Methuselah

Methuselah was awakened from his slumber in Germany by King Ghidorah's call, which also awakened many other Titans around the world. Methuselah erupted from underground, the mountain above him being revealed to actually be part of his body. Like the other Titans, Methuselah rampaged through populated areas, tearing through structures with his horns. Eventually, he made his way to Boston along with Scylla, Behemoth, the Queen MUTO, and a flock of Leafwings. There, they found the alpha they were following, Ghidorah, slain at the hands of Godzilla. Rodan approached Godzilla to challenge him, but was intimidated by his gaze and ultimately submitted. The other Titans all followed suit, each "bowing" in their own way to the new King of the Monsters.