Click to view
This is my interpretation of what a "Previously On Smallville" would look like before the episode of the show in which Chloe Sullivan would be revealed to be Lois Lane.
The premise behind this reveal involves Chloe learning (through her own investigation, interviews, and anonymous sources) of Luthorcorp's Level 33.1, wanting to expose the evil, being threatened by Lex, and eventually, figuring out a way to get the story out...by taking on the name of her murdered cousin.