The big question is if we’re talking about KOTOR/Old Republic era, Clone Wars or Legends New Order cause Viltrumites chances of conquering the SW galaxy will depend on whether it’s an ancient battle experienced Jedi Order, Old Republic plus the Sith Empires, a corrupt Order, Republic and Confederacy manipulated by Palpatine or a flexible and somewhat effective Galactic Alliance and incredibly busted characters like Grand Master Luke Skywalker, as well as the Yuuzhan Vong (worse if we include beings like Abeloth).

Wait did you say invincible or invisible?