 There are two daughters in the Wheaton household Alexia (Katherine Heigl) and Haley (Danielle Harris) each as different as night and day. Alexia is the popular type with no brains, a great sense of style and the jock boyfriend. Haley on the other hand is quiet, shy and excels at math and science. Haley and Alexia don t get along much at all with Alexia hating the fact that she has to drive Haley to school, thus being seen with her less than cool sister. Haley just wants a small portion of Alexia s popularity and one night wishes on a comet that she could become Alexia for one day. The cosmic gods agree and when Haley and Alexia awaken they find themselves trapped in the other s body. This comes as a shock to Alexia who hates the switch and forbids her sister to go to school like this. Naturally Haley is happy as she gets to do all the things she s only dreamed of including dressing up, driving and dating her sisters popular jock boyfriend Kyle (Don Jeffcoat). After the first day ends they realize they may in fact be stuck like this for a while and learn to look at their lives in a different ways. As they both become accustomed to each other s life they begin to relate to one another and become closer as sisters.