Smallville: Obsession

When Clark must use his powers in the presence of a new classmate, Alicia, the two end up getting close when he learns that she also has secret powers she must keep hidden. Their relationship ends up becoming a little too close for Clark's liking when she refuses to let him spend time with anyone else, especially Lana. Lana, meanwhile, turns to Lex for some more effective probing into Adam's life.