No rating information was made immediately available for DIY's Building Alaska; Epix's Britannia; ION's Christmas Together; Science's Unearthed; Showtime's The Reagans; and Up's Christmas on the Range.
NOTE: For the 2020-21 broadcast season, Nielsen has determined that there are 121 million TV households in the United States - with 307.9 million people ages 2 and up. The Adults 18-49 demographic is the rating most commonly reported and helps determine ad rates but is not the sole explanation for whether a show will be renewed or cancelled.