HELEN SLATER RETURNS AS LARA-EL; CLARK MEETS HIS BIOLOGICAL MOTHER FOR THE FIRST TIME – Clark hears the voice of his biological mother, Lara, calling for help from Kara’s 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 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 and Lex each discover Lois and Grant have been seeing each other and warn them to stop.
FORMER SUPERGIRL HELEN SLATER GUEST STARS – Clark (Tom Welling) learns Kara (Laura Vandervoort) is in Washington searching for the crystal. Kara is captured after she breaks into the lab and sedated with a kryptonite-infused truth serum. The serum causes her to relive a prior trip to Earth when she followed Clark’s biological mother, Lara (guest star Helen Slater), to the Kent farm. Clark arrives in time to save her but, after searing the machine with heat vision, he also falls victim to the serum and sees what Kara sees: his mother.