Clark (Tom Welling) hears the voice of his biological mother, Lara (guest star Helen Slater), calling for help from Kara's (Laura Vandervoort) crystal and decides to release her, despite Jor-El's warnings. Lara and Clark reunite and she gives him Jor-El's ring, which contains blue kryptonite. As Clark puts it on, he realizes Zor-El (guest star Christopher Heyerdahl) manipulated the whole thing and that blue kryptonite strips him of his powers, enabling Zor-El to take control of the Fortress of Solitude. Meanwhile, Chloe (Allison Mack) and Lex (Michael Rosenbaum) each discover Lois (Erica Durance) and Grant (Michael Cassidy) have been seeing each other and warn them to stop.