Location from Invincible by Robert Kirkman
The fourth planet from the sun — home to shapeshifting Martians and parasitic Sequids, neither of which NASA warned anyone about.
Mars in the Invincible universe is not the dead planet scientists expected. Beneath the surface, Martians live in hidden communities, and the parasitic Sequids breed in the dark spaces between settlements. Human astronaut missions to Mars inadvertently brought Sequid specimens back to Earth, triggering one of the series' most dangerous domestic crises. The planet is a reminder that the solar system itself is more dangerous than Earth realizes.
Red, barren surface with underground cave systems that house the Martian civilization. Above ground, the familiar rust-red landscape of lifeless desert. Below ground, a hidden world of alien life — the Martians in their shifting forms and the Sequid parasites lurking in the depths.
Also known as: Mars