Godzilla: King of Monsters has officially finished principle production, according to director Mike Dougherty. To celebrate, he took to Twitter and shared a couple of images to signal the milestone and further tease the monster battle royale to come.

The first image -- captioned "Last day" -- shows what appears to be Dougherty's Halloween-themed workspace but we can also see a hat with a "USS Scorpion" label. This is the designation given to nuclear submarines from World War II, perhaps hinting at how the humans will be dealing with the monstrous threats ahead. We also see a tea cup from Monarch, the government agency charged with monitoring all Kaiju activity on the planet, whose presence was felt in Gareth Edwards' Godzilla prequel and in Kong: Skull Island.

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Then comes the second image Dougherty tweeted out -- captioned "That's a wrap. Thank you to my amazing cast and crew." -- which directly addresses Godzilla's opponents in the movie. We see images of Godzilla, but also of Mothra and his three-headed nemesis, King Ghidorah. While Rodan is missing from the shot, he's already been teased along with the rest of the roster.

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The movies in this franchise will culminate in a huge clash which pits their most famed monsters, Godzilla and Kong, against each other. Legendary's MonsterVerse has already grossed over $1 billion in the worldwide box office, and is showing no signs of slowing down with King of Monsters out in 2019 and Godzilla vs. Kong in 2020.

The new story follows the heroic efforts of the crypto-zoological agency Monarch as its members face off against a battery of god-sized monsters, including the mighty Godzilla, who collides with Mothra, Rodan, and his ultimate nemesis, the three-headed King Ghidorah. When these ancient super-species -- thought to be mere myths -- rise again, they all vie for supremacy, leaving humanity’s very existence hanging in the balance.

Debuting in theaters on March 22, 2019, Godzilla: King of Monsters is a production of Legendary Entertainment directed by Michael Dougherty and starring Vera Farmiga, Ken Watanabe, Sally Hawkins, Kyle Chandler, Millie Bobby Brown, Bradley Whitford, Thomas Middleditch, Charles Dance, O’Shea Jackson Jr., Aisha Hinds and Zhang Ziyi.