Rupture

"Rupture" is the twentieth episode of the second season of The Flash, and the forty-third episode overall. It aired on May 3, 2016.

Synopsis
Zoom returns to Earth-1, intent on taking over Central City. Barry and Wells come up with a plan to stop Zoom once and for all but it's extremely dangerous. Barry is intent on recreating the particle accelerator explosion to return his powers, while running the risk of dying during the procedure. Unsure if he should take the risk, Barry reaches out to both fathers for advice. Henry is adamantly opposed to Barry risking his life again but Joe thinks he can handle it which puts the two men at odds with each other. Meanwhile, Cisco is shocked when he vibes the Earth-2 villain Rupture, who happens to be his brother Dante's doppelgänger. Rupture came to this Earth seeking justice for Reverb's death. Iris decides she's finally ready to open up to Barry about her feelings for him.