The Cars and Planes are talking viehicles that live at Radiator Springs.
Lightning Mcqueen is Alpha's crew chief at the go kart place in the Radiator Springs Arena. He used to race, but is now retired until Alpha and Iie made him a racer again.
Mater is Lightning Mcqueen's best friend. He always tows the go karts that get off the track. He also really loves McDonalds that he eats his own burger.
Cruz is the race annoucer in the arena. Lightning Mcqueen is her mentor, and she always gets stuck in the mud.
Sally is Lightning's wife and always cheers his team on. She also makes lots of Vyond "for Hire" videos and bumps with Lightning McQueen on the way to Tees "R" Wii.