That night, Thomas snuck out of the house. Duchess, Toulouse and Marie followed him.

"Thomas," whispered Duchess, "where are you going?"

"To find Beriloz," he whispered back.

"But then Madame will be looking for you, too."

"If there's one important thing for me at this moment, it's to find Berlioz before Labor Day."

Duchess and the kittens gave him a look.

"Why?" asked Toulouse.

"It's my first Labor Day in this family so that's why I want to find you."

"Can we join you, dad?" asked Toulouse.

"Please?" asked Marie.

Thomas thought for a moment.

"Okay, but only you two do your bests to find your brother by Labor Day. Come on."

The four cats took off into the night.

Next morning, Madame gasped in horror as she opened the cradle to find her cats gone.

"Oh, no," she gasped.

"Oh, my," gasped George as he lay in bed looking at what he had seen.

Madame ran out of the room shouting "Duchess! Thomas! Kittens! Where are you? They're gone! They're gone!"

Roquefort popped out of his hole when he heard Madame's shout.

"Duchess! Thomas! Kittens! Gone! Oh, no! Where could they be?"

Scat Cat and his gang ran out of the basement in a startle.

"O'Malley! Duchess! Kittens! Gone! But how?"

"How would I know?" shouted Roquefort and ran to the barn shouting "Frou Frou! It's Thomas! And Duchess! And The Kittens! They're gone!"

Frou Frou whinnied in surprise.

"But how, Roquefort, how?"

"How would I know? Why is everyone asking me this?"

"I'm the worst cat owner in the entire world," Madame said sadly to George, "first Berlioz goes missing and now Duchess, Thomas, Toulouse and Marie are gone, too. How did this happen?"

George put his arm around her.

"Oh, Adelaine. They probably went looking for Berlioz."

Madame's eyes widened with surprise.

"You're probably right, George. So if we find them..."

"Then maybe we can find Berlioz, too," they said together and hurried into the truck, taking around the city.

Madame and George started putting pictures of Thomas, Duchess and the kittens altogether which were copies of the picture they took when Thomas arrived in the family.

Later on, Edgar, Ferreck and Hadris saw the picture.

Edgar was furious.

"Looks like that alley cat had taken my place in the fortune. Ferreck, Hadris, we must find these cats at once. They are the black kitten's family and if we find them and capture them, we would be able to lure the kitten into our trap."

"And what does that kitten go by the name of again?" asked Hadris.

"Just hurry up and find them," boomed Edgar and the three of them headed back into the truck.

Meanwhile, Berlioz and his new friends ran around the city singing a song:

We're the singing stray cats,

And we know Labor Day is coming up,

We're so excited and that's that,

Now that we know we're turning up.

Then Buckster sang:

Running around a carinval,

Watching a firework display,

Then Gerene sang:

Chasing each other around a festival,

What a day, what a day,

Then Mooncho sang:

I will be able to enjoy myself despite me being crazy,

Then Dale and Eric sang:

Just think of all the children that we'll be able to see,

Then Berlioz and Sally sang:

Labor Day's gonna be the best,

It'll bring back good memories,

Then the entire group sang as they ran on their way back to the shack:

We're the singing stray cats,

And even though we,

Are from each other,

We're one big family.

Their song finished in a joy but suddenly Thomas, Duchess, Toulouse and Marie heard the finale of the song and saw Berlioz with them.

"Berlioz," gasped Duchess.

Berlioz was surprised to see his family.

"Mom! Dad! Toulouse! Marie! What are you guys doing here?"

"Looking for you of course, son," said Thomas, "what is the meaning of all this?"

"Well, I joined this group of cats who have the same singing talent as I do. You heard it, right?"

"Yes, we heard it," replied Thomas in a firm way, "and we didn't like it. So you are coming home with us."

"No. Not after what Toulouse and Marie said to me."

"But they have something else to say to you," said Duchess.

"I'm not listening," snapped Berlioz.

"We just wanted to say that...that..." stuttered Toulouse.

"That I'm still different. Yeah, yeah, I know, guys."

"Berlioz, please," panted Marie.

"Would you stop, son?" said Thomas, "it's nothing like that."

"Now, Berlioz. It's in a kind manner," said Duchess.

"No, it's not. They just want to say how different I still am. Well, I agree with them and I've got these guys here to prove it. So goodbye."

And he ran off back to the shack with the other cats to follow.

Thomas, Duchess, Toulouse and Marie walked sadly away.

Sally watched them. She was surprised to see how much his family really cared for him that they would run away to do so.

Then an idea came into her mind. She knew that Toulouse and Marie wanted to apologize just from the way they reacted.

So she would convince it to Berlioz. She ran quickly back to the shack.