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Godzilla: King of the Monsters
Abaddon, also dubbed Titanus Abaddon, is a giant daikaiju created by Legendary Pictures that first appeared in the 2019 film, Godzilla: King of the Monsters, as a minor Titan that obeys Ghidorah and later Godzilla.
"Abaddon" is a Biblical Fallen Angel, sometimes the Angel of Death and sometimes the Angel of Destruction. He is notably mentioned to have had an army of locusts. It is unknown whether Titanus Abaddon has any connection to the angel, or whether it's just a codename designated by Monarch for an unknown reason.
At some point before 2019, Monarch established an outpost around Abaddon in Devils Tower, Wyoming. When Ghidorah calls out to all the Titans, Abaddon breaks free and begins to rampage. She proceeds to attack a nearby city before becoming docile upon hearing the ORCA's frequencies.
- The outpost Abaddon was contained in, Monarch Outpost 77, is a possible reference to the 1977 Toho film The War in Space.