This happened...
SPOILERS!!!Chloe is working late at the Daily Planet using the computers to intercept a file, as a masked figure watches her from the shadows. As she burns it to disc, the figure throws a knife at her and Chloe runs outside, letting the person she's in contact know she's in danger. Chloe gets to the roof where the figure attacks her: a blond woman in black with a black band of makeup across her eyes. She draws a knife on Chloe, but Green Arrow arrives and pins her to the wall. She pulls free and as Green Arrow fires three arrows, the woman deflects them with a sonic blast. She then knocks down Chloe and takes the disc, jumps off the roof, and breaks her fall with a cable.
The next morning, Lana and Clark are at the Kent farm but things are still uncomfortable between them. At the Planet, Lois catches an elevator and trades barbs with new right-wing columnist Dinah Lance, a brunette, who tells Lois Oliver Queen is back in town. Clark talks to Chloe as she looks through files on female criminals and talks about how he's uncomfortable with the fact that Lana expressed her love for his phantom duplicate. Noticing her injury, Clark finally gets her to admit she's doing freelance work for Oliver Queen.
Clark goes to confront Oliver, angry that he put Chloe in danger. Oliver denies putting her at risk and notes they were hacking into Lex's projects. Meanwhile, the woman meets with Lex and turns over the disc, and he offers to pay her to bring him Green Arrow.
Lionel comes to visit Lana at the Isis Foundation and reveals Grant Gabriel was killed, and his suspicion that Lex was responsible. He wants Lana to get the evidence he needs using her spy footage. Lionel points out she held Brainiac's female victim hostage and has never told Clark. He leaves, telling her he'll be waiting for her to contact him.
At the Planet, Dinah Lance breaks into Chloe's desk and checks her phone call log, finding Oliver Queen's number. Clark comes to visit Lana as she goes over her spy footage, and asks her to see if she can connect Chloe's attacker to Lex. She doesn't recognize the woman, but confesses to Clark about the female technician so Lionel can't blackmail her. Clark is angry, and Lana says Bizarro was more affectionate to her and she can't live up to Clark's standards. Clark notes she keeps falling in love with killers and leaves.
That night, Lois goes to Oliver's penthouse to find him waiting for her with dinner. They start to reconcile but the woman arrives on the balcony and shatters the window with her "sonic scream." Oliver is knocked out, and Lois spots Oliver's secret stash of weaponry, broken open by the sonic scream, just before the woman knocks her out.
Lois and Oliver end up tied together and Lois is furious. The woman knocks her out and then accuses Oliver of being a terrorist. He denies it but she calls Lex and has him initiate the wire transfer… unaware that Oliver is using a hidden blade to free himself.
Clark visits Chloe at the Planet and apologizes for getting angry earlier. He then turns over the info Lana has gathered and Chloe realizes someone tapped into her activities at the Planet, from inside the Planet. Dinah Lance was the only one logged on and Chloe alters her photo to confirm she's the woman, who they nickname "Black Canary." Chloe locates the wire transfer and cuts it off. Black Canary goes to see Lex only for Clark to intercept her. Clark insists Oliver isn't the villain but when she attacks him she's bounces off. However, when she uses her sonic scream it overloads Clark's super-hearing, knocking him down long enough for her to escape.
Lana sneaks into Lionel's office and waits for him to arrive, and tells him she's not checking on Gabriel's murder. She insists she's going to be honest with Clark so Lionel has no hold on her, and she's going to try and turn her life around. Lionel doesn't believe her.
Clark and Chloe go to Oliver's penthouse where Lois tries to cover for Oliver. Meanwhile, Black Canary goes to see Lex and demands evidence about Green Arrow's supposed criminal activities. When she refuses, Lex shoots her but Green Arrow arrives and the two men fight. Black Canary arrives and takes out a guard, but as all three heroes shoot at each other, Clark arrives and deflects the bullets and arrows, then gets Black Canary away and lets Lex takes Black Canary's knife blade in the shoulder. Green Arrow walks out, wishing Lex better luck next time.
Later, Oliver is cleaning up the debris when Lois arrives. He asks for another chance but she admits she can't handle someone with a dual identity and regretfully leaves.
Clark comes to visit Lois at her apartment and she admits she still has feeling for Oliver. Clark tries to console her, but she has realized that Oliver's life is demanding and there's no room in it for her, so she broke it off.
Black Canary has set up a meeting with Clark and Oliver to apologize and retire from crime fighting. Oliver suggests it would be a waste and she should join up with his team. Clark again defers on joining up and Oliver strolls away with Dinah.
Clark returns to the farm to find Lana packing up to go stay with Chloe for a few days. Clark confesses to stealing a car and robbing an ATM, and admits it's not easy living with him. Lana says she's been acting a bit two-faced herself but doesn't think Clark thinks she's the one for him. He denies it but says he's going to do what he can to earn her trust.
What happened in the first half?