When a massive alien vessel engulfs Enterprise, non-corporeal beings invade/possess the bodies of Trip and other crew members and hijack their souls. These non-corporeal beings claim to be explorers. But these "wisps" may not plan on giving the bodies back.

When Enterprise diverts to investigate an unusual planetary phenomenon near Earth, Mayweather visits his family after the sudden death of his father, a cargo-ship captain. But his return to his old home, the ECS Horizon, is complicated by family tension. He clashes with his brother, the ship's new captain, and pirates attack the ship. Meanwhile, Archer and Trip invite a reluctant T'Pol for movie night to see Frankenstein and find her reaction surprising. She says she will suggest Ambassador Soval show the movie to every Vulcan newly arrived on Earth.