Perhaps the most pivotal, we see Lana finally discover Clark's secret on her own. She watches him use his powers to save Chloe, leading to a moment of pure joy that is immediately snuffed out by a terrifying ultimatum. The "Magnificent Bastard" Returns
What sets "Promise" apart from your standard CW drama is its unique structure. The episode tells the story of the wedding day three separate times, each from the perspective of the main players: [S5E3] Promise
This move solidified Lionel’s status as the show’s most complex figure—is he acting to protect Clark’s secret, or is he simply the "Magnificent Bastard" ensuring his family’s power? KryptonSite notes that this episode marked the character's return to his full, manipulative glory. Perhaps the most pivotal, we see Lana finally
We see the raw desperation of a hero who realizes too late what he’s losing. Clark finally resolves to tell Lana his secret to save her from a loveless marriage, only to have his hopes crushed by a literal closed door. The episode tells the story of the wedding
She tells Clark, "I'll be there, I promise," referring to their meeting at the barn—a promise she is forced to break.