Sam and Dean are stumped when they investigate a possible zombie case where an amnesiac man (guest star JOHN REARDON) dies and then revives himself once a day. After the guy is attacked by the goddess Artemis (guest star ANNA VAN HOOFT), Sam and Dean realize he's not a zombie but instead a titan – more specifically, Prometheus.
Dunham is still recovering from her traumatic visit to the alternate reality, and Walter gives her a concoction to aid her memory of the happening. Meanwhile, the team investigate a series of robberies that are linked to shapeshifting.
Olivia and co investigate when a kidnapping escalates into a hostage situation in New York. Tensions then reach tangible levels as an ominous threat emerges.
Freya and Frederick celebrate a milestone birthday; Tarkoff puts pressure on Frederick; Ingrid and Dash grow closer; Tommy gets a surprise from Wendy; Joanna faces one of her worst fears.
A friend of the family visits Joanna and Freddie; Wendy, Freya, Ingrid and Dash attend an art gala; Killian doubts his feelings for Eva.