The team learns of a time pirate stranded in the American Civil War. Upon arriving, they encounter a black man, Henry Scott, being chased by Confederate soldiers turned into zombies from a virus carried by the pirate. The team defeats the group of zombies, but Henry is killed. Before his death, Henry reveals he is a Union spy assigned to steal Confederate battle plans for General Grant, and asks Jefferson to complete his mission. The team discovers that Mick is infected with the virus and return him to the Waverider, where Ray and Martin ultimately manage to cure him. Sara and Nate go to warn Grant about the zombies, while Jax and Amaya attempt to steal the plans. Jefferson runs afoul of a plantation owner and is locked up. Amaya frees him, along with other black prisoners. They find the plans and burn down the mansion during a zombie attack. Meanwhile, Grant's camp is also attacked by zombies. Sara formulates a successful plan to kill them using Nate's powers. Jax, as Henry Scott, gives the plans to Grant, which will ensure a Union battle victory. A grateful Mick gives Leonard Snart's cold gun to Ray.The team learns of a time pirate stranded in the American Civil War. Upon arriving, they encounter a black man, Henry Scott, being chased by Confederate soldiers turned into zombies from a virus carried by the pirate. The team defeats the group of zombies, but Henry is killed. Before his death, Henry reveals he is a Union spy assigned to steal Confederate battle plans for General Grant, and asks Jefferson to complete his mission. The team discovers that Mick is infected with the virus and return him to the Waverider, where Ray and Martin ultimately manage to cure him. Sara and Nate go to warn Grant about the zombies, while Jax and Amaya attempt to steal the plans. Jefferson runs afoul of a plantation owner and is locked up. Amaya frees him, along with other black prisoners. They find the plans and burn down the mansion during a zombie attack. Meanwhile, Grant's camp is also attacked by zombies. Sara formulates a successful plan to kill them using Nate's powers. Jax, as Henry Scott, gives the plans to Grant, which will ensure a Union battle victory. A grateful Mick gives Leonard Snart's cold gun to Ray.