Kachow! Best friends Lightning McQueen and Mater are on the road to attend Mater’s sister’s wedding allll the way across the country when they accidentally find themselves at the legendary Cave of the Crystal Hubcap. See, legend has it, whoever gazes into this hubcap becomes the luckiest racer in the world! Mater thinks the hubcap would make the perfect wedding gift and heads into the cave in search of it. Since friends don’t let friends go into caves alone, Lightning joins him.

While inside, they meet a new friend and help her out of a jam. Then Mater spots something shiny, something sparkly. Could it be…?