Iconians

The Iconians were an ancient and highly advanced civilization in the Star Trek Universe. They had the ability to appear at will using gateway technology that enabled instant teleportation. They were an advanced but peaceful galactic superpower, but after a near-genocide event, they converted themselves into energy-based lifeforms and relocated to a Dyson sphere located in the Andromeda Galaxy. They then spent the next 200,000 years planning their return to the Milky Way.