Alien Magma are a cat-like alien race from the planet Magma in Ultraman Leo who were the cause of the destruction of Planet L77 prior to the series.

One month after the destruction of L77, a single Alien Magma from the group that destroyed the planet set his eyes on conquering the Earth, bringing the Giras Brothers with him to attack Tokyo. However, Ultraseven stood in his way, having arrived to defend the planet once again. Seven fought valiantly against Magma and his servants, but was overpowered, then brutally injured when Black Giras twisted his leg until it broke into several pieces.

At that moment, Ultraman Leo appeared to rescue Seven, seeking revenge against the alien for his home's destruction by their hands. Even with the tides of battle in favor of Magma and the Giras Brothers, Leo and Seven managed to hold off the trio. After being beaten down by Leo, Magma and the Giras Brothers retreated for the time being.