Godzilla vs. Kong could culminate in a team-up between the two titular Titans as they go up against Mechagodzilla and Mecha-King Ghidorah. Though framed as a movie about two pop culture icons going head to head, it recently became apparent - as many had long suspected - that Godzilla and King Kong would eventually have to work together against a common enemy, but it's possible that the duo will be facing not one, but two villains.

Though Godzilla and King Kong are two of the most famous giant monsters in movie history, the two have only battled onscreen in one movie. Their first and only encounter was in Toho's 1962 film, King Kong vs. Godzilla. Fans have had to wait over 50 years for a rematch. The fourth MonsterVerse movie, Godzilla vs. Kong will finally grant those wishes by having the King of the Monsters collide with the King of Skull Island in a "spectacular battle for the ages".

Related: Godzilla vs. Kong: Every MonsterVerse Character Returning In The Sequel

Prior to his upcoming showdown with Kong, Godzilla's last opponent in the MonsterVerse was of course the three-headed monster King Ghidorah, a "False King" whom Godzilla dethroned in the final battle of Godzilla: King of the Monsters. King Ghidorah's death paved the way for Godzilla to reclaim his crown and once again become the King of the Monsters. In the immediate aftermath of the fight, Godzilla was recognized by Rodan and the surrounding Titans as their new alpha. Ghidorah was swiftly forgotten by Godzilla and the Titans, but just like Toho's version of King Ghidorah, a return isn't impossible. Here's why Ghidorah could return and find an ally in Mechagodzilla in Godzilla vs. Kong.

Godzilla 2 Set Up Mecha-King Ghidorah In The MonsterVerse

Mecha-King Ghidorah

During Godzilla's second battle with Ghidorah in Godzilla: King of the Monsters, Godzilla tore off one of Ghidorah's three heads. It grew back thanks to Ghidorah's regeneration and energy absorption abilities, but the missing head was rediscovered later and sold to the movie's human villain, Jonah (Charles Dance) in the post-credits scene. What Jonah wants with it isn't said.

This, combined with reveals from the Godzilla: King of the Monsters credits, led to speculation that Ghidorah could return in some capacity. One of the newspaper articles in the credits notes that Monarch scientists on Skull Island were working on a "mechanized giant" and had in the past experimented with creating organic Titans. The idea that the concept of organic Titans exists in the MonsterVerse could mean that Jonah, if he has access to the right technology and resources, could help generate the tissues and organs to recreate the rest of King Ghidorah's body. From there, Jonah and his people could improve Ghidorah with mechanical parts.

There is precedence for this in Toho's movies. In 1991's Godzilla vs. King Ghidorah, Godzilla killed Ghidorah, but human scientists used his remains to transform him into Mecha-King Ghidorah, who they were able to control and send into battle with Godzilla. After King of the Monsters, it didn't seem like a stretch that the MonsterVerse could soon have its own Mecha-King Ghidorah.

Related: MonsterVerse Already Has The Key Element Needed To Build Mechagodzilla

Mechagodzilla Will Appear in Godzilla vs. Kong

King-Caesar-Mechagodzilla

Even so, an entirely different mechanical villain from Toho's library of kaiju may end up being the main villain of Godzilla vs. Kong. A recent toy leak spoiled the inclusion of Mechagodzilla in the MonsterVerse. Mechagodzilla is a robotic duplicate of Godzilla who has fought Godzilla a total of five times in live-action. Mechagodzilla, who is always depicted as a formidable enemy of Godzilla, is now highly regarded as the most likely choice for the main villain of Godzilla vs. Kong.

Mechagodzilla being in the movie makes sense of the "mechanized giant" line in the Godzilla 2 credits. Based on that article, it follows that Mechagodzilla was constructed by Monarch as a secret weapon, whether it be against a rogue Godzilla or malevolent Titans. It could be that Mechagodzilla will be hijacked by the movie's human villains and unleashed against Godzilla and Kong, who will have no choice but to put aside whatever reasons they had for fighting, and team up against Mechagodzilla.

Godzilla And Kong May Have To Fight Mechagodzilla and Mecha-King Ghidorah

Godzilla: King of the Monsters set up Mecha-King Ghidorah in the MonsterVerse, but for some, the theory that he would be the main antagonist of Godzilla vs. Kong was weakened by the Mechagodzilla leak. However, Mechagodzilla's presence in Godzilla vs. Kong doesn't ruin Mecha-King Ghidorah's chances. None of the evidence for Mecha-King Ghidorah is affected in any way by the reveal, and there's no reason why Godzilla vs. Kong can't have two villains, especially if it has two heroes. In fact, it makes even more sense for Godzilla and Kong to fight at least two opponents, as opposed to just one.

Godzilla is hailed as the King of the Monsters in the MonsterVerse, so what does it say about him if he requires another Titan's help to beat Mechagodzilla? It should of course be noted that one of the biggest themes in the MonsterVerse is this idea that when humanity goes against nature, nature always wins. For this reason, Godzilla should fight Mechagodzilla without any help, even if Mechagodzilla's new design has given him some upgrades. Though it's true that Godzilla vs. Mechagodzilla and Godzilla vs. Mechagodzilla II are examples where Godzilla wasn't able to win alone, there are also instances where the opposite was true, such as the fights that took place in Godzilla: Tokyo S.O.S. and Terror of Mechagodzilla. In both movies, Mechagodzilla had to work with other kaiju to fight Godzilla. Perhaps the best option to serve as an ally to Mechagodzilla is Mecha-King Ghidorah. After all, Mecha-King Ghidorah fits the same theme as Mechgodzilla.

Related: Looks Like Godzilla Made Skull Island The MonsterVerse's Monster Island

One of the things that makes the notion of a Mechagodzilla and Mecha-King Ghidorah team-up so enticing is that in 60 years of being in movies, Godzilla has never fought his two biggest enemies at the same time. The idea becomes even more exciting when factoring in the prospect of seeing the Japanese pop culture fighting side by side with King Kong (also for the first time) and engaging in an epic two-on-two showdown with a pair of powerful adversaries in Godzilla vs Kong.

More: What Is Mechagodzilla? Godzilla vs Kong's MonsterVerse Character Explained

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