S4 E1 • Little Foot: Exploring Our Origins

S4 E2 • Fixing A Broken Heart

S4 E3 • The First Picture of a Black Hole

S4 E4 • Recovering From Extinction

S4 E5 • Direct From An Asteroid

S4 E6 • New Horizons: The Kuiper Belt Target

S4 E7 • Modern Day Killer Asteroid

S4 E8 • Herculaneum Scrolls: Unraveling History

S4 E9 • Saber-Tooth Brawl

S4 E10 • Touching the Sun

S4 E11 • Climate Crisis

S4 E12 • Escaping Rip Currents

S4 E13 • Extreme Wildfire Combat

S4 E14 • Greenland is Melting

S4 E15 • Opportunity: A Life on Mars