Zac and the mermaids, including his birth mother Nerissa arrived back at his house. Nerissa was apprehensive about entering and stayed put at the water's edge.

"Mum why aren't you joining us?" asked Zac.

"It's a long story Zac," replied Nerissa. "Ever since your birth, I've been keeping a low profile. I've spent long periods of time transformed in my water dragon state, and I deliberately stayed away from Sun Coast. The Homeworld pod doesn't know of my existence, and I want to keep it that way."

"Will you still keep in touch with us?" questioned Mimmi.

"For sure, you guys are my friends. We all stick together as Rebel Mermaids!" said Nerissa.

Nerissa then left Zac and the others alone as she jumped back into the water.

Inside the guest house

Everyone was now inside Zac's guest house relaxing. Bella announced, "Right everyone, tonight we have a special mission. It's not on Mako Island however, but somewhere further afield."

"Where would that be?" asked Lyla.

"We'll be heading to Tangerine Mountain. There is a large and powerful generator that powers all the Homeworld tech located at the summit. We have to go there and disrupt its power," replied Mimmi.

"How are we going to get there?" asked Zac. He noticed that his father had entered the room and joined in the discussion.

"That's where I come in." replied Dr Blakely. "I have a van we can all use. I regularly travel all the time as part of my work, and I've even taken these mermaids on missions to Tangerine Mountain many times before."

Zac, his father and the three mermaids left the house and saw the van parked outside.

"Wait, how do we all fit in there?" questioned Zac.

"Oh Zac, the mermaids will all be riding in the back." Dr Blakely answered.

"Unlike humans, we don't need to be strapped in." said Lyla. "But we will be cloaked and invisible, just to avoid drawing attention to ourselves."

At Tangerine Mountain

Dr Blakely stayed in the van whilst Zac and the mermaids left to head out for the generator. As they were walking, Bella was the first to speak "Guys, I think we need a proper game plan for this mission. We're dealing with high voltage electricity cables around the generator, so why don't Lyla and I fuse so we have the ability to short circuit them?"

"Are you sure Bella? Last time I recall, your fusion went out of control" replied Mimmi.

"Don't worry Mimmi, it will be just fine." Lyla answered.

"Well, that's settled. Let's fuse!" Bella announced as she and Lyla began to walk up to each other. They grabbed each other's hands and Bella said "Synchronise!"

The two mermaids began a dance, as they twirled around. A white glow enveloped both of them, and within seconds the two of them vanished. In their place was a new mermaid with curly blonde hair.

"Well look who's here! The great Rikki Chadwick!" announced the new mermaid.

"Ooh! Another fusion!" exclaimed Zac. "What awesome power will you use?"

"You'll see," replied Rikki as she began to cast her spell. "Fire devils erupt!" she announced as her spell launched a series of fire tornadoes at the generator. The spell seemed to be working well, as it short circuited the high voltage cables surrounding the generator. But soon the spell went out of control, as the embers began attacking nearby trees. Combined with a strong wind, the embers quickly spread and ignited a bushfire.

Mimmi was not pleased and tried to intervene "Rikki, just stop your spell. You're destroying everything!"

"No way! I'm just getting started!"

The bushfire continued to grow as Zac and the others found themselves stuck in the middle of the forest, with their only way out blocked by the fire. This time, Zac was the one to attempt to reach out to Rikki. "Please, I know you two are in there. Just come out and be yourselves again."

"But I am myself!" shouted Rikki. "I'm sick of others trying to split me up!" Rikki threw her hands forward and launched a flame attack directly on Zac. His clothes started to burn, and he panicked, quickly rolling onto the floor to try and put out the flames.

Mimmi realised what she had to do and stood directly in front of Rikki. She spoke up "If you want to fight then you'll have to go through me!"

"Well then let's bring it on, one on one style!"

Initially Rikki tried the same tactic by launching a flame spell, but Mimmi quickly overpowered it by using her weather manipulation powers. She started creating a thundercloud directly over Rikki and it soon unleashed a burst of rain, soaking her and transforming her into mermaid form.

"Is that the only trick you know?!" said Rikki as she was lying on the floor. She tried to cast another spell, but this time both Zac and Mimmi restrained her arms. Rikki feeling dejected then unfused with another white glow, with Lyla and Bella soon emerging into their normal forms.

"Lyla, Bella – are you two alright?" asked Mimmi.

"Yes Mimmi, we should have listened to you." Bella replied.

"That was another awesome mission! I can't wait for more!" announced Zac.

Lyla did a facepalm as she spoke up, "Well that was exhausting for me. I think it's time for a good long break!"

Mimmi and Bella chuckled as they both answered, "Yeah, that's one thing we can all agree on!"