It’s 1985. Joe Ecks is a rock star guitarist for X Band. He’s a bad rock star, though, despite the fact that he is a musical genius. In an emotional moment, he has a seizure, and his personality changes drastically. The new personality calls itself Mike Smith and is shown to be the direct opposite of Joe’s old personality. For example, the Mike Smith personality loves Joe’s life (including Joe’s wife Angie), and he wants to live it forever. But there’s a hitch: the new personality can’t play guitar. And it’s really hard slipping into someone else’s skin and living their lives. There’s history. And secrets. But to the new Joe, it’s totally worth it. So he frantically learns and practices guitar, because eventually X Band will have to tour. X Band, at first, desperately wants the old Joe personality to return, but as time passes, the band warms to the Mike personality. As the Xylene tour begins, the band, and also Angie, must choose between the Old Joe and the New Joe.