1. Because Zero mocked and looked down on Zeta, thinking that Zeta was half-baked, and Zero was very arrogant, which made Zett dissatisfied, so Ultraman Zeta wanted to fight Ultraman Zero.

2. Zeta originally fought with the violent cosmic shark, and also released skills from the dart-shaped object on his head. Not to be disrespectful, the ferocious space shark also released a light bomb at Zeta. At this time, the person standing in front of Zeta was Zero. Wearing the blue cloak given by his master Leo, Zero is already a "mature" warrior with rich combat experience.

3. Zero thought it was too dangerous to fight against the violent cosmic shark, and asked Zeta not to take action. This made Zeta a little unconvinced. Zeta believed that he was not a dilettante, but was a member of the Space Guard after all, and called Zero his master. Sero said arrogantly that he did not remember taking on Zeta as his apprentice.

4. While Zero and Zeta were talking, the violent cosmic shark spit out a small nova from his mouth, and Zero and Zeta both avoided it. When the violent cosmic shark spit out a ball of light again, Zero blocked it directly and said frankly that he was not afraid of this move at all, but this ball of light was a monster.