Dark Zone (E06)

Dan and Anne are shocked as an alien appears in UG Headquarters. The alien asks for time to recover from his injuries without alerting any hostile forces. Dan and Anne agree. Meanwhile, the UG hones in on an unidentified signal that turns out to be a distress call. It's revealed to be coming from the city of Pegassa, whose interstellar engine has gone out and is on its way to collide with Earth. (Prime Video)