At one point just before the hybrids go on their mission to find Wendy's brother, she's sitting in the lab taking part in an audio test that involves raising her hand when she hears a beep. The key line, which is muttered by a technician shortly before Wendy spots her brother on a nearby screen? "She's beyond our human frequencies. 75,000 hz."

Earth" reached 9.2 million views worldwide through its first six days of streaming. That total, calculated by dividing the total amount of time streamed by the runtime of the episode, refers to viewership on Hulu and Disney+ alone;

"Alien: Earth" is off to a strong start in viewership, scoring 9.2 million views globally in the first six days since its premiere