Smallville - Reckoning

Clark tells Lana his secret, takes her to his Fortress of Solitude and asks her to marry him?

Lex sees Clark using his super powers?

Lana is killed in a car crash?

Nope! Of course not! Another one of those episodes where they do all the things you've been waiting five years for but then in the end they're able to reverse everything so that things are back to normal...
... Clarks dad does die in this episode but that's no surprise... everybody knows that his dad dies of a heart attack around the time that Clark is in college so it was only a matter of time before this was going to happen...