As they race to meet a colossal rainbow matrix order ahead of the Lightning Ridge Opal Festival, the Misfits are forced to work through the night, betting everything on untested DIY contraptions to meet quota. After depleting Diggers Gully of opal, Dan and Renee's hopes of quick and easy cash at their new old timers' claim are crushed when their massive excavator proves too large for the mine's narrow entrance. The Cheals' million-dollar operation is sent into a tailspin after Oscar drops the bombshell of his departure, pushing Chris and Mark to work double time to expand their arsenal of agitators before the team's impending loss.