This is the universe that Invader Zim originates from in 5 Years Later. It first appeared in Chapter 4: The Fallen Gods.
Overview
Zim's Dimension is somewhat similar in basic structure to our earth. Endless cities and suburbs cover a large portion of the planet, and skyscrapers such as Dr. Membrane's lab contain vast metallic labyrinths. Zim has attempted to take control of his Earth many times, but has failed in nearly every attempt thanks in large part to the efforts of his nemesis, Dib.