Things are about to get very interesting on The Flash.

Go behind the scenes of The Flash

To drum up interest in the CW drama's return Tuesday at 8/7c, the network has released a new image of Tom Cavanagh suited up as Harrison's evil alter ego, Reverse Flash. How will Barry handle coming face-to-face with his mentor when he discovers that Harrison was involved in his mother's murder?

Watch the cast of The Flash discuss Harrison's murky motivations below: