一艘救援船坠毁在 M7.8 星上，怪物和超级战士在该星的学校操场上幸福地生活，格罗瑟博士将留在救援船上的孩子命名为“Mah”并将其抚养长大。马喜欢与周围的怪物和朋友共度时光，但完全不知道他的父母在哪里以及在做什么。与此同时，学校即将毕业，每个人都决定开着自己的宇宙飞船去太空旅行以纪念毕业，但突然宇宙飞船失控，带着火星飞向太空。巴尔坦外星人巴鲁，使用他母亲制造的宇宙飞船“巴尔”营救火星，火星开始了一场太空冒险，寻找马的父母。

De Ultraman Kids zijn een lief stel ruimte kinderen op een zoektocht door de melkweg om de vermiste ouders van hun leider Mar te vinden. Onderweg beleven ze plezier en avonturen en leren ze zelfs het een en ander!

The Ultraman Kids are a lovable bunch of outer space kids on a quest through the galaxy to find their leader Mar’s missing parents. Along the way they have fun and adventures and even learn a thing or two!

Mar is the leader of the Ultraman Kids. He’s a curious fun-loving little boy with a taste for adventure and a talent for mischief. Pico is a bright clever girl, capable of anything the Ultra Boys can do. Tar is the strongest of the Ultraman Kids. Unfortunately he’s somewhat lacking in brain power. Sebu is the Ultraman Kids’ resident scientific genius. He’s complete, concise and well-organized, the exact opposite of Mar. Pigco is a lovable, squeezable creature and a fine friend to all the Ultraman Kids. Pigco is always seen together with little Midori. Sometimes it seems as if the two of them are two parts of one strange creature. Varu is the self-proclaimed head of the monster crew. He’s conceited, short tempered and determined to spoil the Kids’ fun.