The Mercury and the Prometheus have lost contact with Hanaka and head for Boldibar, but something awaits them on the other side of the Boldibar portal. Meanwhile Kate and Nelson go over possible targets in DC. Barnes updates Mrs. McMillan on his trip to Chicago. Thornton and Scarlett follow Meredith to a cabin used by his family. Simon finally breaks the big news to the crew of the Prometheus. It's all happening in Episode 278: "Ambush".

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