In alternate realities, Tyrraz was a planet located somewhere in the space of the galaxy, a body that was gutted and reconstructed with technology to be a mobile attack platform. In one version of reality, Tyrraz was assimilated by the Borg. and became their mobile homeworld in their ongoing attempts to dominate the galaxy. In the 23rd century of this timeline, Tyrraz was tracked by the Imperial Planets as an example of the ongoing threats faced to their expansion. (TOS - Legion of Super-Heroes comic: "Issue 2")