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Godzilla: King of the Monsters
"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 all the Titans, Abaddon breaks free and begins to hunt with its new pack. When the ORCA calls all Titans to Boston, Abaddon does not arrive in time to see Godzilla become the new Alpha of all Titans (except Kong).
- The outpost Abaddon was contained in, Monarch Outpost 77, is a possible reference to the 1977 Toho film The War in Space.