Planet Earth II BBC America, 9 ET/PT

The next installment in the

Planet Earth franchise, Blue Planet II, is getting a five-network launch Jan. 20, but don’t miss one of the best episodes from last year’s series. “Cities,” which follows groups of animals that have adapted to live in dense metropolises, is as beautifully filmed and edifying as the rest of the Planet Earth episodes but with a more powerful ending than usual.

Sometimes, the city is the real wilderness. BBC AMERICA