Nova: Season 49, Episode 20

49 - 20: Ocean Invaders

Lionfish – long prized in home aquariums – have invaded the Atlantic and are now one of the ocean's most successful invasive species, wreaking havoc in waters across the globe. Join ocean explorer Danni Washington on a journey to discover how they took over, why they're doing so much damage, and what can be done about it. These fascinating creatures are a window into the impacts of invasive species in a globalized world where human activity is an increasingly powerful evolutionary force.