PBS | 10:00 pm

Season 35 of this critically acclaimed documentary series opens with "Wuhan Wuhan," filmmaker Yung Chang's stirring look at the first wave of the COVID-19 lockdown. Able to get unprecedented access during that period, Chang opens his film in February and March of 2020, as the coronavirus is first discovered in this bustling Chinese city. He goes beyond the familiar statistics and sensational headlines, however, to feature frontline medical workers, patients and ordinary citizens who provide firsthand accounts of that terrifying time when experts were trying to understand this invisible killer.