Stray Cat is a Secret/Classic figure part of the Pirates of the Caribbean collection.
Behaviour During Gameplay
When playing as Stray Cat, the Pirates of the Caribbean environment doesn't change.
How To Unlock
Play as Jack Sparrow and find her in a treasure chest. It is not specified which one, so check every chest you see. When you do find Stray Cat, you'll see a dust cloud on Jack's face and hear a cat's meow.