Clark loses his memory; Lex learns about the hidden chamber in the caves; Lana makes a big decision about her future.

What's up with Lois: Lois is working at the Talon. As she serves a customer she notices a man get up, grab a muffin then take all the cash out of the register. When she confronts him he shoots a greenish beam into her face and she looses her short term memory. The guy leaves with the loot. Clark and Chloe show up and when Lois goes to get change from the register she exclaims they've been robbed. Clark bolts outside and catches the mysterious man driving off. Without a word, he shoots Clark with his mind erasing power and takes off.

What's up with Chloe: She finds Clark, who can't remember anything about his life. Chloe takes him to the farm and he begins to rediscover his powers. Chloe helps him and they look around. Lois shows up and explains that Clark's parents are in Metropolis for Jonathan's heart exam. Looks like it's up to Chloe to help Clark rediscover who he is, while keeping everyone else from doing the same.

What's up with Lana: Jason waits for Lana at her apartment. When she arrives, he shows her a package from Central Kansas, she got in! He suggests they go look at dorms but Lana isn't sure she even wants to go to college. The two get into a fight as Lana says their relationship is based on lies and has no future. Jason seems bitter as he walks off, saying she has no idea how much he's been protecting her.

What's up with Clark: Chloe tells him as much as she knows about his powers. She believes the meteor rocks have given him special powers. Clark and Chloe bond and she tells him she'll never betray his secret. They head back to the Talon to try and find clues to who erased Clark's memory. Clark sees Lana and is instantly attracted to her. The next day at school Clark approaches Lana and tells her he wants to start with a clean slate. Lana says they'll talk later and walks off. Chloe shows up with Lois and tells Clark they've tracked a card they found at the Talon and it belongs to a local man named Kevin Grady.

What's up with Kevin Grady: Kevin packs up at his dad's house. Turns out Kevin was getting treatment at Summerholt Institute but got fed up and left. His dad wants to help, but Kevin zaps his memory and leaves. When Chloe, Lois and Clark show up, Kevin's dad tells them Kevin accidentally fatally shot his brother while hunting and was being treated to erase the memory.

What's up with Lex: Chloe and Clark ask Lex if he can help them get a contact at Summerholt. He agrees and then asks to talk to Clark alone. Chloe reluctantly leaves and Lex takes Clark to the caves. He learns from Clark that there's a hidden room behind the fissure in the wall.

How it ends: Chloe snoops around Summerholt and sends Lois an e-mail containing video that proves Kevin didn't kill his brother, but someone was trying to torture him into believing he did. Clark sees the video and goes to find Kevin. He confronts him and gets him to remember that he didn't kill his brother, his DAD did! Kevin wants to help Clark get his memories back and suggests breaking into Summerholt. Meanwhile, Chloe's gone missing since breaking into Summerholt and Lois gets the sheriff and tries to get answers.

Chloe is trapped in the memory altering lab. Kevin busts in and tackles his dad, but dad fights him off and gets back to erasing Chloe's memory. Clark, who's been bogged down in a room full of kryptonite, finally arrives and uses his head to shield Chloe from the mind altering beams. Clark overloads the system and two huge columns crash down. Clark holds them both up after they knock out Kevin's dad. Just then, Lois and the sheriff come in and see Clark's feats of strength. They're both stunned, but Kevin saves Clark's secret by blasting both Lois and the sheriff with his memory erasing beams. He then shoots Chloe and leaves. Clark unties Chloe then goes after Kevin, he doesn't remember anything that happened between when his memory was wiped and now. Kevin tells him thanks for the second chance and the two shake hands, then Kevin is gone.

Lana and Clark talk and decide maybe they should give their relationship another chance.