Lexa and Indra decide to make a deal with Clarke. As an alliance falls apart, Monty must enact a dangerous plan.
Trying to work off Sloan's debt to Vick Saul puts Jake and Mal at the scene of an accident that they are hired to investigate by the insurance company; their investigation leads them to the Crash Derby, and reveals a possible scam involving more than one of the cars involved, as well as throwing suspicion on the insurance agent. Sloan continues to involve herself in Vick Saul's dealings, much to Jake's chagrin; Jake tries to strike a deal with one of Vick's associates that he hopes will be mutually beneficial. Leslie is forced into therapy before she can return to active duty, but is reluctant to talk to either her therapist or Jake.moreless
After a battle with Cyrus Gold, Oliver is poisoned and left for dead, and Felicity gives him an antidote that causes hallucinations of his past. Meanwhile, Brother Blood captures Roy, Barry continues assisting Felicity, and Lance loses someone when he tries to run surveillance on Cyrus.moreless
Police scientist Barry Allen travels to Starling City to investigate a seemingly impossible robbery from Queen Consolidated's Applied Science Division, and Felicity takes a liking to him... much to Oliver's dismay. Meanwhile, Sin asks Roy for help tracking down a missing friend, and Thea joins her boyfriend in the hunt, only for one of them to be injured.moreless
A deadly illness sweeps through Starling City. When Diggle is struck down, Oliver confirms that the source of the illness is a new version of Vertigo. Tracking down a lead, Felicity is soon captured by The Count, who has escaped prison. Meanwhile, Moira fights for her life in the courtroom against a death sentence, and Laurel is forced to prosecute her when DA Donner is stricken down by the same illness.moreless
Riley turns detective when a man breaks into her home and attacks Lacey. Meanwhile at The Rub, Riley helps her client, Ben Miller, with nerves before a date with his dream-girl and Selena uncovers a secret about Derek and Nikki.moreless
The team takes on a hockey team owner that will stop at nothing--including injuring his own players--to get what he wants.
Herman and Pinky Ames, who almost escaped in 1963, return to Alcatraz in the present day and find something strangely wrong.
The team has trouble with their latest case trying to figure out if a notorious suspect who is known for taking eyes from victims has come back. The CSI's get quite a surprise when a new suspect emerges as a possible killer.moreless