It's been 5 years since Godzilla became a King, an Alpha Predator, & began his Reign, he's been hunting down the MUTOs and his Arc Rivalry: MUTO Prime who killed his father and his kind. He killed every MUTOs one by one. He's finally confronting him alone.

MUTO Prime: So we meet at last.
Godzilla: You murdered my father.
MUTO Prime: Then you will join him with your fate.
Godzilla: This is for my FAMILY!

Then they roared and charged and then they clashed, he threw his punches to MUTO Prime as he can, MUTO Prime punched him then He fired his atomic breath to push him back. He tried to punch with fists and whack him with his tail, but no matter how he tried, MUTO Prime is too strong, He let out his sonic roar much to to his dorsal spines shattered and he was so much in pain then He grabbed his neck and thrown into the mountains.

MUTO Prime: Any last words?
Godzilla: Go to Hell.

Then Godzilla activated his thermonuclear explosion sent MUTO Prime flying and landing so hard in front of him then Godzilla finally crushed his head with his foot seemingly killing him. He glared while growling before he let out his roar in Triumph, seemingly avenging his Father. Then he went back to the sea and into the cave and saw one of the Father's remaining of his Dorsal Spine as it started to glow trying to communicate him.

Godzilla: I did it, father. I finally avenged you, MUTO Prime can't hurt us anymore.

Then he went back to sleep for Hibernation.