Brave Exkaiser (1990)
Original title: 勇者エクスカイザ
Brave Exkaiser is a 1990 Japanese-language animation series created by Katsuyoshi Yatabe. It stars Kumiko Watanabe, Show Hayami and Chie Koujiro.
When aliens plan to invade the Earth, Kouta along with a giant robot from outer space named Exkaiser must team up to save the world and his friends.