The British and Irish Lions rugby union team take on Australia in the first of three massive Test matches on Saturday.
The Lions are made up of the best players from England, Wales, Scotland and Ireland.
They're put together every four years to face one of the world's best rugby teams - rotating between Australia, New Zealand, and South Africa.
In 2009, they lost 2-1 to South Africa. This time round they're hoping for victory against Australia.
Ore gives a rundown of who the Lions are, the players to watch, and our chances of winning!