The Flash is back on Tuesday (May 19th) with its season one finale, 1×23 ‘Fast Enough’, watch an extended trailer above and read the synopsis below!

SPOILER WARNING!

Plot summary – 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). Original airdate 19/05/2015.