Only one person actually guessed who was at the door but they didn't actually get it.

I don't own H2O. I own Serpentine Nickson, Adam Michaels, and Mikey.

Serpentine, Adam, and Mikey walked over.

"It's just a blonde scientist person!" Serpentine said. "How bad can that be?"

"Denman knows about mermaids!" Rikki answered, realizing who it was. "As far as she knows, we gave up our powers!"

"In that case," Adam said. "Hide!"

Mikey shot up the stairs, grabbing Adam as he went. Serpentine closed her eyes and motioned her hand downward. She became water and melted into a puddle. Cleo hid in the kitchen, while Emma, Lewis, Rikki, and Bella dived behind the couch.

There was another knock and the doorknob turned.

"She picked the lock?" Bella asked Emma.

Emma nodded and froze the lock on the door.

Suddenly, the teens behind the couch noticed a puddle nearby. The puddle rose into a form and became Serpentine.

"What are you doing?" Lewis asked.

"Saving your butts!" Serpentine looked at Rikki, Emma, and Bella. "And tails." She grabbed their hands and they all became puddles.

Mikey flew in and grabbed Cleo faster than the eye could see. Then he darted upstairs.

Cleo, Mikey, and Adam looked at each other. It was going to be a long day.

What will happen now that both Charlotte and Denman are back? Will Denman find out? Will Charlotte join Denman? With Serpentine and Mikey's powers, can our favorite mermaids overcome all problems? Why do I have a Scooby-Doo sticker on my bedpost?