Kenny, the 800 year old Immortal in a child's body from The Lamb, has returned. He runs to Anne for help when Immortal Terence Kincaid is after him, and she calls Duncan when she realizes what Kenny is.
In flashback to 1778 South Pacific, Kincaid is the self-absorbed captain of the ship Duncan serves on. When mutineers want to behead Captain Kincaid, Duncan convinces them to maroon him on a deserted island instead.
In flashback to 1182 England, Amanda finds newly-Immortal Kenny after his family has been killed by Normans and teaches him the ways of immortals.
In modern day, having Kenny to care for makes Amanda feel like they have a family, and she wants to keep Kenny around. Duncan, however, remembers Kenny trying to kill him and Anne and isn't so sure that keeping him around is a good idea.