2.17, Rosetta
Chloe, Pete, Lana, and Clark are conversing about a history assignment to do family trees, Pete is the only one not bummed about it claiming that one never knows what mysteries will be found. Chloe points out that the rest of them had their nuclear family "nuked long ago." Lana suggests getting together to plan out the project, when Clark (after hearing an odd whining sound that only he could hear) runs out.
Later, Chloe lets Lana use the Torch to work on the project. Chloe leaves and then comes back to find Lana looking through the pictures from the Spring Formal. Lana tries to deflect the prying charge by telling Chloe to tell Clark about her feelings; Chloe says it's a matter of privacy, following up that she already had told Clark and that he'd called out Lana's name.
Come on Clark, this is Smallville. You've got to at least consider the possibility
Chloe picks Clark up for school the next morning, rushing out the car to see the Kent Barn on fire. She takes photos of it, asking what happened; Martha tells her that it's a prank, but Clark knows that Chloe will print the story. Clark goes over to the Talon, figuring that Chloe's writing and exclusive, and talks over Lana's fight with Chloe; he assumes that Chloe dug into Lana's privacy and then that Chloe should cut her some slack after all the digging she's done.
The next day, Clark confronts her about turning his family's farm into "Area 51." Chloe remarks that it could be a Kansas University prank or that maybe "aliens think that crop circles are passé." Clark says he'll forgive her if she forgives Lana; Chloe tells him that he doesn't need to butt-in to her business. She checks her email which has been spammed with email for Clark from a guy named Swann; inside is an image of the burned barn symbol.
The day after that, Chloe's done some research and realized that Swann was Virgil Swann - "you're being stalked by a legend." She does a profile on him, telling Clark that Swann's mock title was the 'Man of Tomorrow'* and that he has spent the rest of his life looking for alien life forms. When Clark tries to tell her it was just a hoax, she tells him to figure out why one of the most brilliant minds doesn't agree Clark, of course, goes and meets Virgil Swann, as played by Christopher Reeve.
Later that day she comes home to find Lana packing; she tells Lana that when it comes to her feelings for Clark she's never been "really rational" and that she over reacted. Chloe shares her family tree where she marked Lana as her sister, commenting that her family wasn't about the people who didn't love her, but that "it's about the people who do love me. No matter what."
* The same as Superman's in the comics and Clark's slogan for his political campaign in Drone Which of course, is one of the famous Superman titles. And of course, it was a reference to the Superman: The Movie serials given the casting.