"Snakehead" is the ninth episode of the second season of the American science fiction drama television series Fringe. The episode followed the Fringe team's investigation into horrible deaths caused by large parasitic worms erupting from their victims' mouths. The case soon leads them to a Chinese gang and a black market of immunodeficiency medicinal drugs.Co-executive producer David Wilcox wrote the episode, while Paul Holahan served as its director.