Arnold Oscar Jackson is a co-host of Who Will Defeat.
As a co-host, Jackson is jokey and loves to be in charge. He never strives to make a joke of anything or anyone, and is good at it too.
Jackson always wanted to be called by his last name, as he hated his first name. Jackson took part in setting up the bonfire and challenges for the contestants, as well as constructing the boat contestants woud exit in. He loved joking about other people, and it soon became a habit.
- Jackson was originally named Andrew.