This 1984 film centers around Ultraman Taro growing up, and wanting to join the Ultra Brothers in battle. His family, however, thinks he is too young. Taro eventually proves himself after saving the 5 Ultra Brothers from the evil Grand King, created by Juda.
少年ウルトラマンタロウは、ウルトラ戦士に憧れ日々特訓に励んでいた。そんななか、心優しい怪獣ドッグンと出会い……。少年から青年へと成長するタロウの物語を描く、「ウルトラマンタロウ」の外伝とも言える劇場公開5作目。