Zagmuk is a planet in the Olympian Galaxy. Ruled by the Sumerian pantheon over a million years ago, it was later acquired by Demeter.

SPOILER WARNING: Plot details after Beyond The Impossible #122

Upon learning that the coordinates of the Dragon Tomb were kept in Zagmuk, Torn was dispatched to recover them and slaughtered a contingent of Demeter soldiers to prevend them from obtaining the information. However, going against orders, Torn spared the life of a Myridian officer and kept the coordinates to himself. It's unknown if the planet was later colonized by others.

First appereance: Beyond The Impossible #122