Flash, Killer Frost, and a newly repowered Vibe track down the Anti-Monitor's weapon of destruction and meet an electrifying new hero. Ray, Ralph, and Iris go to recruit the Paragon of Humanity, while Constantine helps Mia and Diggle recover Oliver's soul.

Barry and Iris plan a romantic dinner for Valentine's Day but their evening is interrupted by an old foe – Amunet. Meanwhile, Frost gets into the holiday spirit and attempts to help Allegra reconnect with an old love.