This is the companion Web site to "Deep Sea Invasion," a PBS NOVA documentary broadcast April 1, 2003. The program follows marine biologist Alexandre Meinesz and his scientific detective work to explain the rampant spread of the tropical alga Caulerpa taxifolia through the Mediterranean and his struggle to instigate control efforts. The features of this Web site include a timeline chronicling the invasion, an article by Meinesz on the impact of invasive species, another article addressing strategies for controlling invasives, and an interactive quiz in which users match up species with their invasive characteristics. With interesting material covering a range of ecological topics, this Web site should be of interest to any reader.