With about 7.8 million viewers, Halle Berry's new sci-fi series was the most-watched program of the night.
"Extant" averaged a rating of 1.5 among the 18-to-49-year-old demographic desired by advertisers. The Steven Spielberg-produced show mostly maintained the ratings elevation of its premiere last week. In week two, the show was down a mere 6% in 18-to-49.
Privacy-deprivation reality show "Big Brother" trailed slightly behind "Extant" in overall viewership with about 6.2 million tuning in but had a rating of 2.0 in the key demo, making it the highest-performing show of the night by that measure.