'The Flash': Time Travel and Reverse-Flash to Change Everything

Grant Gustin and EP Andrew Kreisberg say much of the season's storytelling culminates Tuesday: "The audience will learn a lot of new information."
Diyah Pera/The CW

The Flash will finally dive into time travel in Tuesday's episode.

The plotline has long been hinted at, with the show revealing that an adult Barry (Grant Gustin) was present at the time of his mother's murder years earlier. Since then, viewers have been waiting for Barry to use his speed to travel back in time to that fateful night to face his mother's killer, Reverse-Flash (Tom Cavanagh).

See more 'The Flash': Every Major DC Character on The CW Series       

A trailer for upcoming episodes teases that the last five minutes will change the course of history, which Gustin confirms is related to the anticipated plotline.

"That is a reference to time travel," Gustin tells The Hollywood Reporter. "Not necessarily the characters — but the audience will learn a lot of new information."

The series has slowly revealed its secrets, letting viewers in on the knowledge that Wells (Cavanagh) is Reverse-Flash. But the STAR Labs team is only slowly beginning to suspect something is amiss with their mentor, with Det. West (Jesse L. Martin) confiding his suspicions to Cisco (Carlos Valdes).

A poster showing Wells in full Reverse-Flash gear teased that he will make an appearance in this episode. As the suspicion about Wells spreads, it will cause major problems for the STAR Labs team.

Read more 'The Flash' Eyeing Other Speedsters for Season Two

"The idea that he might not be the incredible, sort of perfect man that Caitlin thinks he is is going to be a real challenge," says Danielle Panabaker (Caitlin), whose character has stood by her mentor, even after an accident he caused was believed to have killed her fiance Ronnie (Robbie Amell).

Flash and Arrow Executive Producer Andrew Kreisberg says he considers Tuesday's hour to be the most ambitious episode of the series to date. In addition to the mysterious time travel element, Barry must contend with The Weather Wizard (Liam McIntyre), the brother of Clyde Mardon (Chad Rook), who died in the pilot episode. This villain is a darker presence than previous rogues, and his plan to avenge his brother's death is perhaps the most sinister one Barry has faced.

"It's full of genuine scares. It's the best version of the show," Kreisberg said during a press screening attended by THR Monday. "Between this and Arrow, there are only a handful of episodes that, amongst ourselves we say that about, and I definitely feel like this is it."

Stay tuned to The Live Feed for much more from The Flash after Tuesday's episode.

The Flash airs at 8 p.m. Tuesdays on The CW.

Email: Aaron.Couch@THR.com
Twitter: @AaronCouch