Clark meets his biological mother (Helen Slater) for the first time; Chloe and Lex discover that Lois and Grant have been seeing each other.
On the other side, Lincoln joins forces with his alternate and Bolivia as they look for a vigilante with a connection to the shapeshifters.
Flashbacks reveal a haunting connection between Marshall and the early migration; Jude investigates a mysterious disappearance; Sophie risks her life and career to help Reece save her daughter.