River Monsters

(Animal Planet, Monday, 9 p.m.)

Join biologist Jeremy Wade as he travels across the world, including India, to solve these freshwater mysteries, debunk myths, and track down harrowing tales. Join Jeremy in Alaska and explore his face-to-face encounters with mysterious flesh-eating predators, gargantuan fish and other river monsters.

When We Left Earth: The NASA Mission

(Discovery Science, Saturday, 9 p.m.)

“When We Left Earth” is the story of mankind’s greatest adventure, leaving the earth and living in space. For the first time, this series has digitally re-mastered the original film and audio recording from NASA’s vaults, including the key on-board footage filmed by the astronauts themselves.

From John Glenn’s Mercury mission to orbit the earth, to Neil Armstrong’s first historic steps on the moon, to the unprecedented spacewalks required to repair the Hubble telescope, these epic stories are told by the astronauts and engineers who were there.