Extra-galactic was a term for objects situated, occurring, or originating outside the gravitational bounds of the galaxy.
The extra-galactic Yuuzhan Vong hailed from another galaxy.
Notable extra-galactic and alleged extra-galactic species included the Yuuzhan Vong and the Chazrach, the Kwa, the Nagai and Tofs (originating in Firefist), and the Silentium and Abominor droid species which may have originated in the Yuuzhan Vong's home galaxy. The sentient ship (and its pilot) Luke and Leia encountered also originated in another galaxy.
The InterGalactic Banking Clan had influence as far as the Rishi Maze and Firefist.
The Sith Emperor Vitiate, when telling the Hero of Tython his plans for his galaxy-destroying ritual, said that there were other galaxies beyond theirs and that he would experience or ignore them as he wished. This implied that he, or the Sith Empire, had means of reaching these locations—assuming the galaxy-destroying ritual would not also consume the hyperspace disturbance at the edge of the galaxy.
At some point during the height of the Galactic Empire, the Imperial Senate issued Intergalactic Passports to allow the owner to travel throughout the six known galaxies. In addition, Arhul Hextrophon in a guest lecture for the Brionelle Memorial Military Academy speculated that Emperor Palpatine by the time of his resurrection and ruling of the Dark Empire may have planned to eventually engage in extra-galactic conquest due to his usage of World Devastators.
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