Hostile Planet Main cast, played by Bear Grylls Episode 1x01: Mountains (Apr 1, 2019) Episode 1x02: Oceans (Apr 8, 2019) Episode 1x03: Grasslands (Apr 15, 2019) Episode 1x04: Jungles (Apr 22, 2019) Episode 1x05: Deserts (Apr 29, 2019) Episode 1x06: Polar (May 6, 2019)