DC's Legends of Tomorrow Season 1 Episode 9 : Left Behind

Ray, Sara and Kendra are shocked after they watch the Waverider fly off without them, leaving them stranded in the ‘50s. After waiting months for their teammates to come back, the three realize they must move on with their lives. Ray and Kendra bond as a couple but Sara decides to return to the League of Assassins and Ra’s al Ghul.