Watch Online Free on Watchseries. 'Uninvited: The Spread of Invasive Species' tells the story of non-native species and the massive impact they've had on local ecosystems, our economy and human health. Battling these invasives is a complex and expensive task, but simply "letting nature take its course" is far more costly. The documentary highlights many species including Spotted Lanternfly, Emerald Ash Borer and Japanese Knotweed.