Avenger (アヴェンジャー, Avenger) is an anime series, produced by Bandai Visual, Bee Train and Xebec, and directed by Koichi Mashimo. It is set on post-apocalyptic colonized Mars. The series premiered across Japan between 1 October 2003 and 24 December 2003 on the TV Tokyo network. It was later licensed for North American distribution by Bandai's distributive unit across the region, Bandai Entertainment.
The story is set on a colonized Mars at some unspecified point in the future. The majority of the human population is divided up into a number of small domed city-states. Those who live outside the domes in the harsh wildernesses of the planet are known as Barbaroi. Resources are scarce, and supplies are divided out between cities based on the outcome of gladiatorial battles between representative fighters from each. Adding to the problems of the colonists, no children have been born on Mars for a decade. The cause of the inferitily is unknown, but people have turned to robots called dolls as a substitute for the presence of children in their lives. And a red moon, Earth's moon, hangs over Mars, drawn towards the red planet after the destruction of Earth and ravaging it with lunar storms caused by gravitational fluctuations between Mars and its unwelcome satellite.
The protagonist of the story is Layla, a barbaroi gladiator with a mysterious past and follows her quest to defeat Volk, the ruler of Mars. She is accompanied on her journey by Nei, a strange "doll", and Speedy, a doll breeder (or repairman).