Master Roshi and Bulma in “Unfinished Business”

His name may sound funny, but, I can assure you, there's nothing humorous about that savage beast. With him came darkness and chaos. His minions of terror wreaked havoc upon the land, destroying all in their path with indiscriminate fury. No one knew what they wanted or why they had come. But they were here; laughing as our world crumbled around them. Piccolo and his army destroyed one city after another with little opposition - except for one temple. It was in this secluded sanctuary the beast faced a meager, but determined, school of martial artists. As the horde invaded the temple, the young fighters banded together for a final assault. Though hopelessly outnumbered, they were united. And with their combined strength, they offered a formidable defense. Many demons fell that day and alongside them - even more great men. When the battle was over, only two of the warriors were left standing: Myself and Crane Hermit. Unfortunately, the skirmish had barely made a dent in Piccolo's forces. Desperate and out of time, we concentrated our energy into a shield that absorbed the enemy fire. And, with a breath of luck, reflected it back at them. One bright light. That's all I remember. But somehow, it worked. The horde was vanquished. It was finally over, or so we thought. Apparently, the monsters were just an opening act for King Piccolo himself. We barely got a glimpse of his ugly mug before he dismissed us with a wave of his hand. Against his might were but rag dolls caught in a storm. Shin and I were young and in our prime. We gave everything we had and still King Piccolo prevailed. All those lives lost and we didn't lay a scratch on him. He was immune to everyone, even Mutaito.

Who's Mutaito?

He was my master.