Historian Hank Heywood notices the presence of the Legends in the past, and contacts Oliver Queen. The two of them find Waverider--and Mick--in the waters of the Atlantic. Once revived, Mick tells them what happened to the team in 1942.

Nate discovers that thanks to the Nazi serum, he can transform his skin into steel. However, in his first training session, he accidentally blasts himself and Ray out of the ship... and into 1641 Japan. Meanwhile, Jax and Martin discover a hidden compartment in Waverider and a cryptic message from a friend.