Well, let's see: outside of the galaxy. We have the Kelvans, builders of the Doomsday Machine, builders of those androids from I, Mudd, Catspaw aliens...the novels have O from the Q Continuum books and what's-her-name from the Shatnerverse books...I saw a fan series (Iliad? Odyssey?) with another invading species from the Andromeda galaxy. Am I missing any other previously seen potential suspects?
We don't know from where the bluegills hail from, in canon. They could also be extragalactic. Could explain why they apparently didn't return after "Conspiracy". Maybe it took all that time for them to get back to our galaxy...
And because this episode reminded me very strongly on "Where Silence Has Lease", i think i keep Nagilum on my list of suspects. Maybe he also has an extragalactic origin.
By the way, if Zora gets a synth body, i think there will be trouble for Adira and Grey's relationship in the future

Think she either already has fallen in love with Grey or will, from what we have seen...
A 10 for me

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