When the Legends hear that Mona has let a fugitive go, they must head to 1961 Mexico City to clean up her mess. Mona tries to convince the Legends and the Bureau that the people responsible for releasing the fugitive were some mysterious Men in Black and not her. With no evidence to back up her theory, the Legends must decide if they should trust her and go against the Bureau. Meanwhile, Nate and Zari go on a recon mission to find out what Hank might be hiding from everyone.