Smallville :

At Chloe's birthday party, the birthday girl is sad that she doesn't have an exciting life like Clark or Lois. A mysterious magician named Zatanna grants Chloe's wish to be more like Lois and switches the two into each other's bodies. Zatanna searches for her father's book of spells so she can conjure up his spirit, but not before also granting Clark his deepest wish.

Clark notices that Lois is acting oddly. She finally has to admit that she is really Chloe and needs Clark's help to find Zatanna and sort out this mess. Zatanna informs her that the curse will only be lifted when Chloe no longer wishes to be Lois. Clark inadvertently wishes to have a more normal life, which deprives him of the knowledge of his abilities. Zatanna visits Oliver and offers to grant him one wish if he can find her father's book of spells. Oliver gets the book, and Zatanna sets out to bring him back to life. But she will lose her own life as a consequence. Clark's memory returns and he recalls his heritage. He convinces Zatanna not to kill herself but instead use her powers to honor her father's memory.