You Wish!, on Disney Channel
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Alex Lansing (played by A.J. Trauth, aka Twitty from Even Stevens) gets like a magic coin and makes a wish on it that he never had a brother, because his little brother Stevie (Spencer Breslin) is always messing up his life. So the wish comes true and Alex's life is everything he wanted it to be. Although everything he thought he wanted turns out not to be what he thought it'd be. Plus he misses his little brother, I guess. It turns out Stevie still exists, but he's just unrelated to Alex. He's now an actor named Terrence Russell McCormack, who stars on a popular TV show called "Where's Stevie?" Anyway, Alex and his friend Abby (played by Lalaine, aka Miranda from Lizzie McGuire) meet Terrence, and they all work together to try and undo the wish. Because despite being a big TV star, Terrence isn't happy with his life, either. No privacy, no freedom, and all that. It's not a bad movie, but not something I particularly feel the need to see again.