It's down to the final three, In this week's Mars Reward Challenge its lights, camera, action as the contestant prove themselves worthy of representing their sponsors. Today, they'll be starring in a Shannons TV commercial to see if they've got what it takes. Then they head to the Shannon's Supercar Showdown track for their first solo hot lap in the Renault Megane R.S. 250 Cup Trophee Challenge Cars.