if you are asking when does Chloe knows about Clark, and doesn't forget about it by the end of the chapter, then it's the one from the 4th season called Pariah, one of my fovorites where Alicia dies.
what about season 3 episode 6 when lana great aunt and jor-el are making out u can see kristen's right boob when they are laying down on the hay and making out is that a body double or not?
"It's more than just a history lesson. The story of the dynasty's beginning, of Kal-El, and one Lois Lane... Is a love story... that isn't over yet." -- Platinum, JLA: DC One Million
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That was Clark, the boy raised in Smallville, the man trying to carve a life for himself in Metropolis. A life which the most important element was a vivacious young woman named Lois Lane.
You can always see boobs in like every show, its not really bad unless you see nipple. ANd I guess thats a pretty kewl epesode, i like how he scares that one guy at the end.
Crusade just cause we gotta see Clark fly (well Kal-El), which is awesome.
and Onyx because we got to see the real Lex Luthor, it was so sweet. Lex when hes evil is an awesome character, hes got no powers but is still a match for Clark. good episode.