Smallville 7.11 "Siren" – description

Smallville episode 7.11 “Siren” airs Feburary 7, 2008.

Official description from CW:

While secretly working for Oliver (guest star Justin Hartley), Chloe intercepts one of Lex’s project files, but she is attacked by the Black Canary (guest star Alaina Huffman), a mystery woman with a subsonic cry. Dinah Lance, Black Canary’s alter ego, is a conservative talk show host who is working at the Daily Planet and clashes with Lois. Lex convinces the Black Canary that the Green Arrow and his team are terrorists so she launches an attack on the Green Arrow and Clark. Meanwhile, Lois discovers Oliver’s secret. Kristin Kreuk, Aaron Ashmore, Laura Vandervoort and John Glover also star.

[trailer] [promo images1] [promo images 2] [director's cut]

source: spoilerfix