Pete, Chloe and Clark turn into thrill-seeking daredevils. Clark show off his powers and kisses Chloe in front of Lana.

What's up with Pete? Several kids wind up dead after dangerous accidents during and after a rave party in the cave. All had puncture wounds in the back of their necks and enlarged adrenal glands. Although he doesn't realize it, we've seen that Pete has been punctured while he stood beside the cave wall. Clark is worried about Pete's daredevil behavior. He thinks Pete might have been slipped a drug at the rave party. Pete tells Clark to butt out of his business. Using his x-ray vision, Clark sees he has a live parasite inside his body. Pete keeps him away using a green kryptonite rock.

What's up with Chloe? When Clark and Chloe investigate the cave, Chloe touches something green and sticky and gets a sharp pain in the back of the neck. Her behavior gets aggressive and cocky. Worried about Pete, Clark enlists Chloe's help to meet up with Pete to get him to the hospital. In doing so, he has to break a date with Lana. As they meet, Pete slips a red kryptonite rock into Clark's pocket to join their reckless thrills.

"Bad Clark:" Unknowingly under the influence of red kryptonite, Clark gives Chloe demonstrations of his powers, revealing his secret. Chloe thinks his alien news is cool, and calls Clark her own "personal superhero." Lex interrupts, asking Clark not to interfere with the professor's cave studies. Clark warns Lex to stay "the hell away..." With Pete driving, Chloe and Clark are making out in the back seat. At Chloe's urging, they stop at the Talon to make out some more and play an imaginary game of strip poker. When he takes his shirt off, the red kryptonite falls from his pocket and he snaps back to reality. Lana comes in and finds them, crying as Chloe flaunts the flirtation.

What's up with Lex? Lex hires Professor Walden, a foremost linguist to interpret the cave drawings. The professor finds a parasite nest in the cave with cave drawings to match the creatures. His crew destroys the nest, and a live specimen is sent to a lab. The lab results show the parasite's DNA is unique and not like anything on earth. Lex tells the Professor the news and wants him to allow Clark full access to the cave, reasoning that Clark knows something.

How it ends: Pete knocks Clark out, with green kryptonite hidden in his punch. Lana douses him with water, waking him up. Pete and Chloe race Pete's car off the gorge. Clark has raced to the scene, catching the car before it hits the ground. Clark takes them both to the hospital, where the parasites are extracted. Chloe says she doesn't remember anything since the parasite invasion. Apologies fly as Clark apologizes to Lana when she visits Chloe in the hospital. She won't forgive him. Later at Clark's house, Pete apologizes to Clark and his parents. They forgive him and say they're sorry for the burden he carries with Clark's secret. Later at the Talon, Lana won't accept Clark's second apology and is hurt that Clark was kissing Chloe. He leaves, she throws his red "peace" rose in the trash.