Tonight is an all new episode of The Flash and The CW has shared a preview clip from it. The episode “Rogue Time” features a Snart family reunion as Leonard Snart’s (guest star Wentworth Miller) sister Lisa Snart (guest star Peyton List) joins the fun. In the preview clip, the duo are attempting to rob a casino, but Barry intervenes. Do the brother and sister have something up their sleeve? Check out the preview clip below, then be sure to tune in tonight at 8 p.m. ET on The CW to watch the full episode of The Flash!