Smallville Season VII Episode XI

While working for Oliver to intercept Lex's confidential information, Chloe is attacked by Black Canary, who is dedicated to seek justice with her subsonic power.

After finding that Green Arrow is behind the attacks on his falicities, Lex pays Black Canary to get rid of him. During Canary's attack at Oliver's place, Lois discovers that Oliver is the Green Arrow.Clark manages to convince Canary that Lex is the villian, and Canary accepts a spot offered by Oliver on his team.