Tyrraz is a fictional artificial planet in the 30th century DC Universe

DC Universe

The DC Universe is the shared universe where most of the comic stories published by DC Comics take place. The fictional characters Superman, Batman and Wonder Woman are well-known superheroes from this universe. Note that in context, "DC Universe" is usually used to refer to the main DC continuity...

.

It is the homeworld of Legion

Legion of Super-Heroes

The Legion of Super-Heroes is a fictional superhero team in the 30th and 31st centuries of the . The team first appears in Adventure Comics #247 , and was created by Otto Binder and Al Plastino....

 foe Tyr

Tyr (DC Comics)

Tyr is a fictional supervillain in the DC Universe. He first appeared in Superboy Vol. 1, #197 , and was created by Dave Cockrum. His name is taken from Týr, the one-handed Norse god of war.- Pre-Zero Hour:...

, who was the ruler of this planet.

Tyr had the planet cannibalized and transformed into a mobile world, which then travelled throughout the galaxy attacking other planets.

One of The Controllers

The Controllers

The Controllers are a fictional extraterrestrial race existing in the DC Universe. They first appear in Adventure Comics #357 , and were created by Jim Shooter, Mort Weisinger, and Curt Swan.-Pre-Crisis:...

 is tasked with stopping it, and begins construction of a Sun-Eater

Sun-Eater

A Sun-Eater is a fictional, artificially created living weapon in the DC Comics universe. It has played an important role in various storylines.-History:...

to destroy it. These plans are foiled when a Legion squad, not knowing its intent, destroy the Sun-Eater factory. The Controller then captures these Legionnaires, explains the situation, and forces them to help him in destroying Tyrraz.