Season 3 Episodes9
Cast1

Erik Dellums
Self - Narrator
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Ranked #5 of 9 in Season 3•matches the season avg
Asteroids strike, planets collide, black holes blast out death rays, volcanoes erupt and ice engulfs the planet. These are the universe’s weapons of extinction. They’ve happened before - wiping out entire species, and they will happen again. Are we next?

Erik Dellums
Self - Narrator
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"Weapons of Mass Extinction" is episode 6 of How the Universe Works season 3. It scored 8.5/10 from 115 votes, ranking #5 of 9 episodes this season (season average 8.5). It aired on August 13, 2014.