Yuusha Exkaiser Episode 45: Pyramid de Dai Bouken
Episode 45 of 48 of Yuusha Exkaiser, aired December 29, 1990, 25 minutes. Available with English subtitles and dub where released.
Episode summary
When aliens plan to invade earth, the young Kouta along with a giant robot from outspace named Exkaiser must team up to save the world and his friends.