The CW has released the official synopsis for "Left Behind," the March 31 episode of DC's Legends of Tomorrow.

In the episode, Sara, Ray and Kendra find themselves stranded in th 1950s, and Sara goes to meet Ra's al Ghul at the League of Assassins again (for the first time).

John Showalter directed the episode written by Beth Schwartz and Grainne Godfree.

You can check out the synopsis below.

SARA RETURNS TO THE LEAGUE OF ASSASSINS – Ray (Brandon Routh), Sara (Caity Lotz) and Kendra (Ciara Renée) 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 (guest star Matt Nable).