He and his family seem to be the only cats in the series who actually can talk.

"You are not the only fat cat around so don't think that killing will be difficult."

And I wasn't the only cat trying to find him.

And Rusty has to learn he isn't the only cat in the world.

It turned out that Madison was not the only cat stuck on the block, or even in his building.

And right now, he's the only cat making it happen on this level.

He was probably the only cat in the country who owned a press card signed by the chief of police.

"Why would he be the only cat with such talents?"

They are one of the only cats who can not roar or purr.

Since entering the Palace, the tom was the only cat he had seen.