Oscar was the cat owned by the Blackthorn family in 2002.

Both seven at the time, best friends Emma Carstairs and Julian Blackthorn dyed the previously white Oscar a bright blue; mischief for which Julian took responsibility, though it had been Emma's idea.[1]

Oscar had already died some time before 2008, and it was his time with the young Blackthorn children that convinced them to keep Church the cat.[2][3]