: Iris becomes increasingly suspicious that Eddie is hiding secrets from her, unaware that he is protecting Barry’s identity as The Flash.
: Cisco begins experiencing "dreams" of the alternate timeline where Wells killed him, which Joe West suspects are actually memories of a timeline that no longer exists. [S1E18] All-Star Team-Up
: Ray Palmer visits because he needs help refining his A.T.O.M. suit. Watching him "geek out" with Cisco and Caitlin provides much of the episode's charm. : Iris becomes increasingly suspicious that Eddie is
: The primary threat is Brie Larvan (the Bug-Eyed Bandit), who uses a swarm of robotic bees to target her former colleagues. [S1E18] All-Star Team-Up
The episode serves as a lighter "breather" crossover before the season’s high-stakes finale.