The CW has released an official description with spoilers for the November 7 episode of DC’s Legends of Tomorrow!
The episode is called “Return of the Mack” and the description can be found below.
HELPING ONE OF THEIR OWN — When Nate (Nick Zano) thinks he has found a pattern to the anachronisms, it leads the Legends to London in 1897 to hunt down a time-traveling vampire. When they arrive in London, they run into Rip (guest star Arthur Darvill), but not everyone welcomes him back so quickly, leaving Sara (Caity Lotz) to make a tough choice in the end. Amaya (Maisie Richardson-Sellers) tries to connect with Zari (Tala Ashe), but she is still struggling with being part of the team. Meanwhile, Stein (Victor Garber) discovers what Ray (Brandon Routh) and Jax (Franz Drameh) are up to and is not entirely pleased. Dominic Purcell also stars. Alexandra La Roche directed the episode written by Grainne Godfree & Morgan Faust (#305). Original airdate 11/07/2017.