Season 1 Episodes6
Cast1

Harry Standjofski
Narrator
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Ranked #3 of 6 in Season 1•−0.3 vs season avg
A giant hidden planet with a gravitational pull so strong that it would literally cause the earth to turn upside down is on course to destroy us. Planet X has caused mass extinctions in the past. Some are preparing for the next celestial Armageddon.

Harry Standjofski
Narrator
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"Planet X" is episode 3 of How the World Ends season 1. It scored 6.1/10 from 16 votes, ranking #3 of 6 episodes this season (season average 6.4). It aired on February 26, 2017.