The Flash: Everything We Know About Season 3

Felton, best known for starring in the Harry Potter franchise, has joined the cast as CSI named Julian Dorn. The character isn't established in the DC universe, so we don't yet know what to expect from Julian. We do know that he's suspicious of his fellow investigator, Barry.

As Grant Gustin has teased on Twitter, The Flash is taking on a famous storyline known as Flashpoint. It pivots off the scene from the finale when Barry travels back in time to save his mother and creates an alternate timeline where his life is very different. "We're definitely doing this FP thing our own way," Gustin later wrote on Twitter. "I've read Flashpoint, I've seen the amazing animated film. This will be its own thing."

While Supergirl and The Flash have already had a crossover, and The Flash is constantly intertwined with Arrow, The CW is going to bring all four of its DC shows together for one gigantic crossover in December.

The first look at season four was released during Comic-Con.

The Flash is set to return on Oct. 4!