Smallville Season VI Finale

Lana makes a decision to leave Lex, and confides in Clark, who eventually plucks up courage to tell her his alien lineage to persuade her to stay. At the mansion, Lana has a showdown with Lex. When she gets into her car to leave, the car explodes.
Clark is devastated upon hearing about it and promptly suspect Lex is responsible. Rushing to the secret tunnel, Clark is surprised to find that the last phantom escapee is laying waste to the place. The phantom wraith uses Clark's DNA to create a bizarre version of Clark and escapes, ending the season.