When did Horizon Season 7 Episode 22 air?
Horizon Season 7 Episode 22 aired on August 31, 1970.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
The population explosion of the Crown of Thorns starfish is investigated by Horizon.
Direct answers for episode-level questions and details.
Horizon Season 7 Episode 22 aired on August 31, 1970.
This episode runs for approximately 60 minutes.
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