For Earth Day, enter some of the most dangerous jungles in the world

Here’s what’s happening in the world of television for Monday, April 22. All times are Eastern.

Top pick

Hostile Planet (National Geographic, 9 p.m.): Today is Earth Day, and what better way celebrate than to enter the world’s most diverse animal habitat? Tonight, NatGeo’s six-part documentary series Hostile Planet will enter the most extreme jungles of the world, and explore how deforestation and climate change have made life in these habitats difficult for their inhabitants. For a taste of what’s in store, check out this clip of a fur seal getting wrecked by a great white from the “Oceans” episode.

Regular coverage

DC’s Legends Of Tomorrow (The CW, 8 p.m.)

Wild Card

Gentleman Jack (series premiere, HBO, 10 p.m.): Set at the tail end of the Industrial Revolution, HBO’s new drama Gentleman Jack follows landowner Anne Lister (Suranne Jones), who’s “determined to transform the fate of her faded ancestral home by reopening the coal mines and marrying well,” but has no intentions of marrying a man.