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It's possible that Ghidorah gains a new power (or ability) in Godzilla: King of the Monsters, one that hasn't been previously revealed. Years ago, Legendary Entertainment and Warner Bros. announced plans to expand Gareth Edwards' Godzilla reboot into its own shared universe, and they followed it up with Jordan Vogt-Roberts' Kong: Skull Island in 2017. But before fans get to see the two monster kings battle in Adam Wingard's Godzilla vs Kong in 2020, the iconic kaiju has another solo movie on the way.
Michael Dougherty's Godzilla: King of the Monsters continues the story that left off with 2014's Godzilla film and sees three new monsters - Mothra, Rodan, and Ghidorah - join the fold, along with potentially multiple other, smaller kaiju (who are officially known as Titans in the MonsterVerse). According to Godzilla: King of the Monsters' second trailer, all of the monsters are battling Godzilla for dominance, and his biggest challenger will undoubtedly be Ghidorah, whose sheer power and might dwarf Godzilla's in multiple iterations - and that may be magnified, perhaps a little, in the new movie.
At the 1:17 mark in the latest Godzilla: King of the Monsters trailer, viewers can briefly see (and hear) the spikes in Ghidorah's tail open up, thus meaning that the spikes can be retracted. It's not something that's been explicitly shown in Toho's old movies, which means it could very well be a brand new ability or power in Godzilla: King of the Monsters, depending entirely on what Ghidorah can do with its tail. If Ghidorah can simply retract the spikes on command, then it's an ability, but if Ghidorah can do something unique with the spikes, then that's something else entirely.
In addition to figuring out what Ghidorah can do with its tail, it remains to be seen if both tails have retractable spikes or just one of them. After all, each of Ghidorah's three heads has a different personality (and they're all being portrayed by different actors in the film). So, that also begs the question, which of Ghidorah's heads controls the spikes? Lots of questions have arisen since WB started marketing Godzilla: King of the Monsters, and there will certainly be more as the movie's release date gets closer.
One thing's for sure, though, Ghidorah will use everything it has to defeat Godzilla in Godzilla: King of the Monsters, which is hinted at around the 1:55 mark in the second trailer, in which Godzilla can be seen with a gash above his eye, presumably from being attacked by one of Ghidorah's tails. Depending on what happens in the movie, Ghidorah might become the true king of the monsters - and it'll be well-deserved considering just how powerful the three-headed dragon truly is.