Certain that Alec’s disappearance is more than an accident, Abby and Matt venture into the swamp, where she encounters Swamp Thing. Scientist Jason Woodrue comes to Marais.

It’s Halloween time at The Jeffersonian as the team gets a surprise visit from Lt. Abbie Mills and Ichabod Crane, who have traveled from the spooky town of Sleepy Hollow…

A return home doesn’t go as expected.

Rick and the group are still having trouble assimilating into Alexandria. Will a new threat bring them closer together or drive them further apart?