Volunteers launched a campaign on social media to uncover how the moggy ended up on the other side of the world - and the post has been shared more than 18,000 times.
The cat is currently on a drip after suffering kidney failure. Cats Protection spokesman Gillian McMullen said: 'I responded to a call from a member of the public who was concerned about a stray.
'The poor cat was starving but obviously had been cared for in the past because it was wearing a collar. We discovered it was microchipped and this is where the mystery begins.'
The microchip revealed that Ozzie was born in 1989, making him 25 - ten years older than the age of the average cat and roughly 117 in human years.
Miss McMullen went on to say: 'The cat had been microchipped in Australia, and in 2004 he turned up as a stray in a vet clinic in London, but no owners could be traced. If only he could tell us about his life - and tell us how he got here!'
- Daily Mail