Carter must fight off a plague of destructive objects; an 11th-hour development threatens the Astraeus ship and its crew.
Grace embraces an honor that puts a burden on her bond with Henry. Deputy Andy becomes a guinea pig for the Astraeus mission-with a disastrous outcome.
Sheriff Carter and Allison Blake are preparing a holiday surprise for their kids. But a mysterious kaleidoscopic wave of color collides into Eureka, causing the entire town to become animated.