Witness the battle for a living planet in this exploration of the environmental movement. Watch Tuesday, April 22, 2014 at 9pm.

With unprecedented access, FRONTLINE uncovers the raw reality of solitary confinement. Watch Tuesday, April 22, 2014 at 10pm.

Follow a troop of snow monkeys in Japan to see how they prepare to face the world. Watch Wednesday, April 23, 2014 at 8pm.

Explore the social lives of some of the smartest animals on the planet. Watch Wednesday, April 23, 2014 at 9pm.

Find out which traits our primate progenitors bequeathed to us. Watch Wednesday, April 23, 2014 at 10pm.

Pink Floyd tribute band celebrates Pink Floyd's classic album 'The Dark Side Of The Moon.' Watch Thursday, April 24, 2014 at 8pm.