ALDNOAH.ZERO

ALDNOAH.ZERO is an anime series directed by Ei Aoki (Fate/Zero) and written by Gen Urobuchi (Madoka Magica, Fate/Zero). The series can be streamed on Aniplex Channel, Hulu, Crunchyroll, and DAISUKI.

Plot
In 1972, the Apollo 17 mission discovered a hypergate to Mars on the surface of the moon. Soon a war breaks out between Earth and Mars, and Martian soldiers begin to descend from the sky, riding steel giants, intent on exterminating humanity.

Other Sources
Anime News Network Crunchyroll