David Tennant as Narrator (voice)
Episodes 2
When Worlds Collide
January 4, 2009
• 1h
1x1
Real-life footage from camcorders and mobile phones captures the amazing impact they can have.
Read MoreOne Million Heads, One Beautiful Mind
Season Finale
January 11, 2009
• 1h
1x2
Extraordinary photography reveals the incredible swarm intelligence that lies behind animal invasions.
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