In Godzilla x Kong: The New Empire, Kong finds a hidden tribe of apes in Hollow Earth, defeats the tyrannical Skar King with help from Godzilla, Mothra and the freed ice Titan Shimo, and becomes leader of his own tribe.
Kong lives alone in Hollow Earth, looking for any other members of his species. On the surface, Godzilla keeps the Titans in check and kills one that attacks Rome. Monarch detects a signal that Jia seems to feel, and it turns out to be a distress call from the Iwi, who live under portals leading to the surface.
Kong discovers a hidden tribe of apes that includes a young ape named Suko. The tribe is ruled by the tyrannical Skar King, who uses a crystal to force an ice breathing Titan called Shimo to obey him. Shimo injures Kong's arm, and Trapper gives him a prototype glove that restores his strength.
Jia awakens Mothra, who is worshipped by the Iwi. Godzilla soaks up radiation and has a short fight with Kong before Mothra calms him. The three Titans then go to Hollow Earth to face the Skar King's forces.
The Skar King and Shimo escape through a portal to Rio de Janeiro, where Shimo's power starts a new ice age. Suko destroys the control crystal with Kong's axe, which frees Shimo. Shimo turns on the Skar King and freezes him, and Kong then shatters him.
Afterward, Godzilla melts the ice in Rio de Janeiro with his atomic breath and goes back to rest in the Colosseum in Rome. Jia decides to stay with the Iwi, and Mothra restores the barrier that protects them. Kong returns to Hollow Earth with Shimo and Suko and takes his place as leader of his tribe.