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Identical twins Elizabeth and Jessica Wakefield have the chance to star on the big screen! They were such a hit in the Corny O's cereal commercials that the director has asked them to try out for his next movie. The girls are shocked to see so many other twins vying for the same parts at the audition...and nobody is friendly. The Gilbert twins put sneezing powder in the Parker twins' sweaters. The Parker twins mix ketchup in the Gilbert twins' blush.   Elizabeth and Jessica know they're talented enough to win the roles without stooping to sabotage. But when they become the Parker twins' prime targets, the Wakefields have only one choice: Play dirty.