Ever since the series premiere, "The Flash" has been leading up to next week's big season one finale. Last night's episode set the stage and now Barry Allen (Grant Gustin) is prepared to go on the most important mission of his life: saving his mother from Reverse-Flash (Tom Cavanagh). The CW has released a trailer for next week's big episode, which is titled "Fast Enough," and it teases a reunion that Allen family fans never thought they'd see. "Fast Enough" airs next Tuesday on the CW.

Longer, 60-second trailer:

And the original 30-second teaser:

EPIC SEASON FINALE; VICTOR GARBER AND ROBBIE AMELL GUEST STAR - Wells (Tom Cavanagh) presents Barry (Grant Gustin) with a life-changing choice. Dr. Martin Stein (guest star Victor Garber) and Ronnie Raymond (guest star Robbie Amell) return to help the S.T.A.R. Labs team with this final fight. Dermott Downs directed the episode with story by Greg Berlanti & Andrew Kreisberg and teleplay by Gabrielle Stanton & Andrew Kreisberg (#123).