S10 E12: Chloe Sullivan returns. Clark, Oliver, Lois and Dinah are released by the VRA after being captured at Hawkman's funeral but each of them has flashbacks of Chloe holding them against their will. When Chloe returns, Dinah warns the others that Chloe may now be a traitor. Oliver dismisses her concerns, but Clark is unsure if he can trust Chloe after she disappeared without an explanation.
Starring Alaina Huffman, Allison Mack, Ted Whittall