MATER'S BIRTHDAY SURPRISE (DISNEY/PIXAR CARS) Mater thinks all his friends in Radiator Springs have forgotten his birthday—until they throw him the best surprise party ever! This Step 2 reader starring Lightning McQueen, Mater, and the rest of the cars from Disney/Pixar Cars and Cars 2 will make a perfect birthday gift for children ages 4 to 6. Step 2 readers use basic vocabulary and short sentences to tell simple stories. For children who recognize familiar words and can sound out new words with help.