The CW have released the official episode description for "Promise"
On the day of Lex and Lana's wedding, Lex receives a call from Dr. Langston who threatens to tell Lana the truth about her baby. Lana begins to have second thoughts about marrying Lex and Clark comes to his own realization that he can't let Lana marry Lex and decides to tell her about his secret. However, no one is prepared for what happens when Lionel Luthor steps in.
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