Ana Mercedes

Oliver must tackle a new threat when bombs start to go off in Starling City. Felicity discovers the person setting them off is Mark Sheffer (guest star Sean Maher), a man who goes by the nickname "Shrapnel." Arrow discovers Shrapnel's next target is Sebastian Blood's "Unity Rally" and tries to talk the alderman out of hosting it, but he refuses. Arrow sets off to stop the bombing, but Shrapnel tricks him and traps him in a bomb-laced antique store where he is unable to move without setting off the device.

Arrow teams up with Laurel to find the man in the mask. Conflicted after Laurel reaches out to the Arrow asking him to investigate Sebastian Blood, Oliver is unsure whether to believe her accusations against the man he has publicly supported for mayor, but decides to trust Laurel. However, when the pair gets too close to the truth, Sebastian exposes Laurel's drug addiction and has her arrested. Meanwhile, Roy reveals his new super-strength to Sin who wants to test out his abilities. Unfortunately, Roy isn't able to contain his rage once unleashed and almost kills a man. Back on the island, Oliver is surprised when Sara reveals a secret about Laurel.

A stunt driver is caught in a hairy situation; the city is on high alert after two mail bombings.

Eddie's journey to rescue a boy from a well turns into a mission to save himself from his past.

After a mysterious death, Hen and Chimney put their lives in danger when they suspect that someone is playing God to make themselves look like a hero; Eddie visits Texas, where he attempts to reconcile with his father.

Demons of the past come back to haunt Gibbs when he finds a cryptic message waiting for him at a crime scene.