A new Weather Wizard arrived in Central City while Cisco arrived at the conclusion that Harrison may have something to do with Nora's murder.
Colin Sweeney returned with a lawsuit against a TV film about his life, and Alicia competed against Prady for a major campaign donation.
Oliver now has a very big choice to make.
Thea and Oliver traveled to Lian Yu, where they did battle with a newly released Slade.
Vertigo returned with a new a strain of his patented fear drug as Oliver and Laurel clashed over Laurel donning Sara's costume.
Flash and the team set out on the hunt for Ronnie as General Eiling returned to Central City. Meanwhile, Joe asked Cisco to help investigate Nora's murder.
Caitlin and Barry tried to move on from their lost relationships while a new metahuman tried to break her beau out of prison.
Diggle and Roy aren't happy with Laurel's new crime-fighting persona, but they may just have to deal with it as Brick makes his move on the Glades.
A former whiz-kid from S.T.A.R. Labs returned to take revenge on Harrison with a killer sound. Meanwhile, Iris joined the city newspaper.
Team Arrow is struggling to keep Starling City safe in Oliver's absence.
As Barry and Joe came to grips with Iris moving in with Eddie, Captain Cold returned with a new plan for dealing with the Flash.
Alicia and Prady squared off in two kinds of debates while Chicago braced for a potential riot.