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- “Assimilation”: The Borg have experimented on several Undine captured during their invasion of fluidic space, and managed to fully assimilate at least one.
- “Mindscape”: The player encounters illusory Assimilated Undine in Tuvok's mindscape. A remnant of Seven of Nine's katra speculates that they represent the Undine's fear of the Collective.
The original, pre-Season 9 assimilated Undine.
- The appearance and abilities of the Assimilated Undine were given a complete revamp with the release of Season 9: A New Accord.