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.
MARTIAN MANHUNTER RETURNS – When Clark discovers Lionel threatened to kill him unless Lana married Lex, he goes after Lionel to silence him once and for all. Lana tells Lex she is leaving him, and Martian Manhunter makes a return appearance to help Clark stop Lex, who is trying to find the last wraith from the Phantom Zone in order to use its DNA to power his army of super soldiers. Meanwhile, Lois goes to Reeves Dam in search of information about Lex’s secret lab and is brutally stabbed by a security guard. Chloe’s secret power is revealed.
CHLOE HELPS CLARK LEARN ABOUT HIS SUPERPOWERS AFTER HE LOSES HIS MEMORY – Kevin, a boy who has the power to wipe out people’s memories temporarily, turns his powers on Clark (Tom Welling) and accidentally causes him to have total amnesia. Chloe (Allison Mack) looks after him and teaches him about his superpowers while simultaneously trying to keep them secret. On his trip down memory lane, Clark meets Lana (Kristin Kreuk) and falls in love all over again. Lex (Michael Rosenbaum) takes advantage of the situation and attempts to unravel some secrets.