When one choice shifts history, entire worlds rise or collapse.
Explore pivotal moments when a single decision changes the fate of nations, empires, and wars. This season examines alternate outcomes behind events such as Prohibition and Al Capone, the Aztec Empire, Constantinople, the Fronde, and Dunkirk. Sign up to see how history can turn on one overlooked moment, and why the consequences still fascinate.
Episode guide
13 episodesLove Butterfly Effect (Season 2)? It’s just the start.
Join now to unlock the whole library — thousands of award-winning documentaries beyond Butterfly Effect (Season 2), from the deep ocean to deep space.
Trending Now
- New shows weeklyFresh documentaries land every week.
- Exclusive originalsAward-winning films you can’t stream anywhere else.
- Watch anywherePhone, tablet, web and TV — pick up where you left off.
- No commitmentNo contract. Cancel in a click.
Pick the plan that’s right for you.
Flexible plans, no contracts.
Thousands of documentaries across nature, history, space, and science.
- Watch in 4K on all your devices
- Download and watch offline
- Stream ad-free — cancel anytime
Thousands of documentaries across nature, history, space, and science.
- Up to 4K
- Offline downloads
- Ad-free
Frequently asked questions
Thousands of the world's best documentaries and factual programming — nature, history, science, technology, and biography — including exclusive Curiosity Originals like Butterfly Effect (Season 2). Stream it all ad-free, anytime.
Butterfly Effect (Season 2) streams with every plan. Plans start at $4.17/month.
Watch on the web, iOS and Android, Roku, Apple TV, Amazon Fire TV, Chromecast, Android TV, and most smart TVs. Start on one device and pick up right where you left off on another.
Curiosity Stream is our streaming service — thousands of documentaries and originals. The Smart Bundle is Curiosity Stream plus four other independent streaming services (Tastemade, Kidstream, Curiosity University, and SOMM TV) on a single subscription.