Graham Shiels

On election day, someone tries to create turmoil in the U.S. presidential election, and Team Scorpion is called to investigate.

The CBI team investigate the death of a documentary film-maker. As they make links to an older murder case, Jane is taken hostage by the prime suspect.

It's Halloween and the NCIS team are busy investigating a ransom case. A marine's daughter has been kidnapped after the kidnapper attacked the marine in his home. When the team learn that the marine and his wife are separated, they decide to focus on the wife's ex-boyfriend. Meanwhile, McGee and Tony are stunned by Abby's Halloween costume.

The agents uncover a dangerous game of chance that is killing Chinese immigrants and securing internal organs for the black market.

A seemingly impossible robbery at Queen Consolidated's Applied Sciences Division brings Central City police scientist Barry Allen (guest star Grant Gustin) to town. Citing a similar case back home, Barry offers to help Oliver and his team with the investigation. Oliver senses there is more to Barry than meets the eye, but he's distracted by the similarities between this current case and something that happened on the island. Meanwhile, Felicity takes a liking to Barry, which doesn't go unnoticed by Oliver. Sin asks Roy for help when a friend of hers goes missing. Roy is surprised when Thea not only encourages him to help, but joins the search. Unfortunately, Sin's friend is connected to Brother Blood (guest star Kevin Alejandro), and their search ultimately gets one of them seriously injured.