|Full name:||Jack Ellsworth|
|Species:||Domestic cat (Felis catus)|
|First Appearance:||Not yet|
Currently, not much is known about his role in the new version of Stardust.
Jack is shown to be a slender cat with a rather long muzzle and big ears. His pelt is dark, bluish grey, with the bridge of his nose and the insides of his ears being of a darker colour. His nose and pawpads also have a dark colour. Jack has green eyes, with the sclera being of a lighter shade of green.
Furthermore he wears black jacket, and a blue kerchief around the neck, which has red and white stars on it. Jack also wears a white shirt, blue trousers with a red belt, and black shoes.
Due to Stardust being revisioned, his personality is currently unknown.
On Rodger's reference sheet it is shown that Jack is one of Rodger's friends.
Valentina is one of Jack's friends.