Following his capture in the last episode, Eobard Thawne -- who has masqueraded as Harrison Wells (Tom Cavanagh) for twelve years -- finds himself trapped in the Pipeline in "Fast Enough," the season one finale of "The Flash." In this new clip, Barry (Grant Gustin) confronts him face-to-face in order to finally learn why the Reverse Flash killed his mother.

"The Flash's" season finale airs tomorrow, May 19 at 8 pm EST on The CW.