Joe and Cisco investigated Harrison's past while Barry squared off against an identity-shifting metahuman.
A new metahuman arrived in Starling City at the worst possible moment.
Felicity and Ray from Arrow swung by Central City to seek some help just as a bee-themed baddie set her sights on Mercury Labs.
Alicia fought the cries for a recall only to be undermined from within. Meanwhile, the firm scrambled to save itself from Kalinda's forged evidence.
Alicia faced the press on the matter of the leaked emails, while Diane went to court over gay marriage. Oh, and Andrew Wiley is back.
Ra's has stepped up his game to "sweeten" his offer to Oliver by turning the entire city against the Arrow.
Barry and Joe turned to the original Trickster for assistance when a copycat arrived to terrorize Central City.
Alicia navigated the spoils of victory while the firm dealt with being hacked.
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.