Sleeper (S07E17)

Clark desperately searches for Kara (recurring guest star Laura Vandervoort) and Brainiac (recurring guest star James Marsters), as Brainiac is the only one who can reverse Lana's condition. Clark asks Chloe to check any large power surges in the area, so she breaks into several government computers, setting off alarms. Jimmy is caught between the Department of Security -- who threatens him with jail time unless he helps them arrest Chloe -- and Lex, who offers to help clear Chloe if Jimmy agrees to be in his debt. (Warner Bros. UK)