Artine Tony Browne

Oliver is shocked when he learns that Slade has come to Starling City. Back on the island, as Oliver, Slade and Sara prepare to take over the freighter from Ivo (guest star Dylan Neal), Sara pulls Oliver aside and tells him he needs to kill Ivo to prevent him from telling Slade what happened with Shado. Oliver feels immense guilt over the situation but realizes Slade's growing rage from the Mirakuru makes him unpredictable and he could turn on his friends if he thinks Oliver is to blame. Oliver agrees to kill Ivo and the battle begins.

Emma follows Capt. Hook up a beanstalk in hope of finding a magical compass; a fellow thief wants to make an honest woman out of Emma.

When Frank Bertinelli (guest star JEFFREY NORDLING) is arrested, Oliver knows it's only a matter of time before his daughter, Helena, aka The Huntress (guest star JESSICA DE GOUW), returns to town. To make matters worse, Laurel is picked to try Frank's case, putting her right in the path of Helena. Oliver tells Sara he will handle his ex-girlfriend, but when Helena takes hostages at the courthouse, including Laurel, the Canary will stop at nothing to save her sister. When The Huntress and Canary meet, an epic battle begins. Meanwhile, Roy realizes he needs to keep Thea safe, but doesn't like the way he is forced to go about it.

Oliver's world starts to crumble when Slade makes his move against Oliver – and the repercussions are enormous. While Oliver scrambles to protect his family, a key player in his team starts to question Oliver's decisions. Meanwhile, Isabel makes her move to take Queen Consolidated away from Oliver.

It's Chloe and Jimmy's dream wedding day, but two unexpected guests crash the party. Plus, Clark goes looking for Lex -- and finds Lana (former series star KRISTIN KREUK) instead.

The team investigates when people are discovered in a trancelike state that ultimately leads to death; Walter meets with Nina at Massive Dynamic.