Back in the fish tank, Nemo had been swimming every day with Gill, learning how to use his small injured fin. Already he was swimming faster, more smoothly.

As Nemo swam past, Gill noticed Nemo's eyes on his withered fin.

Nemo knew he didn't have much time. Only two more days. Then Darla would come to take him away.

"My first escape," said Gill grimly. "Landed on dental tools. I was aiming for the toilet."

Nemo thought for a minute and then looked at Gill seriously. He knew he had to do everything he could to help them all escape.

"The toilet?" Nemo asked.

"All drains lead to the ocean, kid," Gill replied.

The fish gathered by the bubbling filter. "Now, once you get in, you swim down to the bottom of the chamber, and I'll talk you through the rest," Gill said to Nemo. It was up to the little fish to stop the machine.

It was finally time for the next step in the plan: jamming the filter so that the tank would get dirty.

Nemo held his breath and popped his head through the surface. He saw the water wheel.

Nemo grinned. He began to swim out of the filter. But the pebble slipped out of place. Whirrrr! The filter started working again!

"Do you see a small opening?" Gill asked.

Then he leaped into the air and onto the wheel. He flapped as the wheel spun, then flipped himself through the gap. He landed in the bottom well of the filter. He was inside!

Together, the Tank Gang yanked on the plant. They managed to pull off a branch and shove it into the filter tube.

Gill was right outside the filter. He scooped up a pebble from the bottom of the tank and threw it to Nemo.

Nemo followed Gill's instructions. After one failed attempt, the whirring noise stopped. The filter was jammed!

Nemo nodded.

"Inside it, you'll see a rotating rod. Wedge that pebble up against the rod to stop it turning. Careful, Shark Bait."

The giant blade jerked, then turned. It was pulling Nemo back into the filter. In seconds he'd be sucked inside, toward the rotating blade.

Gill raced over to a plastic plant. "Stay calm, kid. Just don't panic."

"Gill! Help me!" cried Nemo.

"That's great, kid," Gill said. "Now go up the tube and out."

"Gill, don't make him go back in there," Peach said.

"Grab hold of this!" Gill called to Nemo. Nemo stretched his fin. Closer, closer… He had it! But he was still about to fall into the sharp, spinning blade!

Nemo was suddenly free. He was outside the filter -- safe, but shaken up pretty badly. The little fish began to cry.

Gill and the others held on to the branch and pulled -- hard.

"No. We're done," Gill said, unable to look any of the other fish in the eye.