S8, E13: Clark finds Tess in Lana's (Kristin Kreuk) ransacked apartment and realizes Lana is missing. Tess tells him Lex is still alive and may have kidnapped Lana and finally reveals the truth about what happened to Lana after she awoke from her Brainiac-induced coma. Meanwhile, Tess breaks into a secret LuthorCorp facility and is shocked at what she discovers.