When did Horizon Season 11 Episode 1 air?
Horizon Season 11 Episode 1 aired on January 7, 1974.
Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 11 · Episode 1
A Matter of Self-Defense
Jan 7, 1974·1h
This episode of Horizon explains how our body fights infections and cancers and brings us up-to-date on recent research in immunology.
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How long is Horizon Season 11 Episode 1?
This episode runs for approximately 60 minutes.
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