Clark and Lionel switch bodies; Lana researches the history behind her symbol; Another Kryptonic artifact is found.

What's up with Clark: Coach Teague tells Clark that a college coach is coming to watch Clark at the next game. Clark is excited, until he hears a ringing in his ears, he takes off. The sound leads him to the Kansas State Penatentury, where Lex is meeting with Lionel.

What's up with Lionel: Lionel has a month before his liver gives out on him and he will die. Lex comes to visit and Lionel tells him he has regrets. His biggest is he never told Lex he loved him, he extends his hand. Just as Lex is about to take it, Clark bursts in and sees that Lionel has something in his hand, he pushes Lex out of the way and Lionel and Clark clasp hands. When they're pulled apart, they've switched bodies, now Clark (in Lionel's body) is hauled back to prision and Lionel (in Clark's body) walks free.

What's up with Lionel (in Clark's body): Lionel slowly begins to realize why Clark's been so secretive. He discovers his super strength, speed and all his other new powers. Needless to say, Lionel is giddy. His arrogance grows and he begins to destroy Clark's relationships with everyone in Smallville.

What's up with Clark (in Lionel's body): Lionel's cellmate, Edgar, is shocked to find that it's Clark, not Lex who's in Lionel's body. Turns out Edgar's a mathmatical genius who Lionel had framed so he'd be in prision to help him find Kryptonian artificats and dycypher their symbols. Lionel's been scowing the globe for artifacts and eventually found the one they used to transfer bodies. Meanwhile, thugs are threatening his life and in Lionel's body, he has no defense.

What's up with Lana: Lana's been researching the countess from France and after she tells Jason what she knows, they kiss. Lionel (in Clark's body) hears them and busts in, smugly telling them he knows all about them and walks off leaving them dumbfounded. When Lana confronts Clark (Lionel) he kisses her and she storms off.

What's up with Martha: Martha notices that Clark's (Lionel) eyes are different. Lionel (Clark) gets Martha to come see him in Prision. She doesn't believe it's him until he recants a story from when he was 6-years-old. She's shocked and Clark tells her what's happened. He warns her Lionel came to see him and Lex is in trouble.

What's up with Lex: Lionel tries to get his hands on the $57 million he had before he went to prision. Dispite all his attempts, he realizes Lex has taken it. He's furious and in Clark's body confidently strolls into see his son. Lex realizes that it's not Clark talking. When he draws a gun on him, Lionel uses his new super speed to evade the shot and take Lex down. As the talk, Lex realizes it's his father talking.

How it ends up: Just as Lionel is about to kill his son, Martha walks in with a piece of kryptonite, saving Lex's life. A confused Lionel attacks Jonathan demanding he tell him what weakens him. Jonathan, knowing it's not Clark, Jonathan divulges nothing. When the phone rings, the answering machine picks up Edgar, telling Lionel there's a problem.

When he gets back to prision, Edgar tells him that the transference will eventually come to an end. The only way for it to be perminate is if Lionel kills his old body. Clark fights a thug in prision and a riot breaks out. During the riot, Lionel and Clark meet with Lionel using his new body to manhandle Clark. While he's being grabbed, Clark reveales the artifact and the two switch back to their original bodies. The artifact is lost, but Clark's back to himself.

A doctor tells Lionel that his liver is entirely desease free and he has no idea why. Lionel tells him that he's not the same man he was. Clark now has to deal with rebuilding the relationships Lionel destroyed while he was in Clark's body. Chloe tells him to seek metal help, Lana is flat out mad, and Clark learns of her relationship with Jason. He's a bit taken back, but agrees to keep it a secret. Lana's still not happy with him. Lex is the only one not mad at Clark. He thanks Clark for saving him. Clark asks him to help Edgar, he agrees and Edgar is free. A woman is waiting as he leaves prision and he gives her the artifact.