Eureka 's Season 4 finale, "One Giant Leap," centers on the chaotic launch of the Astraeus ship, which is sabotaged and sends the crew on an unplanned flight. While Sheriff Carter manages to resolve a localized black hole crisis in town, Dr. Allison Blake becomes trapped aboard the ship as it disappears, setting up a major cliffhanger for the series. For more details, visit Eureka Wiki .

'Eureka: One Giant Leap' Episode 420 (Season Finale) – Recap