All Star Team Up

"All Star Team Up" is the eighteenth episode of the first season of The Flash, and the eighteenth episode overall. It aired on April 14, 2015.

Synopsis
Barry is surprised when Felicity Smoak arrives from Starling City along with her boyfriend, Ray Palmer, who flies in as the Atom. They’ve come to visit S.T.A.R. Labs as Ray needs help with his suit. Their timing turns out to be fortuitous because it's all hands on deck after a person named Brie Larvan unleashes hundreds of robotic bees to attack and kill her former co-workers, including Dr. Tina McGee. A group dinner with Barry, Felicity, Ray, Iris and Eddie turns into a disaster.

Behind the scenes

 * Cisco's quote, "Bees, why did it have to be bees?" is a reference to Indiana Jones' quote, "Snakes. Why did it have to be snakes?" from Raiders of the Lost Ark.
 * Upon Ray Palmer's arrival Caitlin and Cisco have an exchange when they see something flying in the air. First asking if it's a bird, and then a plane, and Felicity replies that it's her boyfriend. This is a reference to the iconic Superman phrase, referencing Brandon Routh's former title role in the 2006 Superman Returns.
 * The Atom saying, "We have the technology!" is a reference to The Six Million Dollar Man.