Blowfish

History
Pufferfish is lethally poisonous if prepared incorrectly, fugu has become one of the most celebrated and notorious dishes in Japanese cuisine.The Fugu Blowfish is only seen once per season, making it one of the more minor animals in the series. However, every time it appears, someone gets severely poisoned.

Total Drama Island
The blowfish was used in the Extreme Cooking challenge in the Total Drama Island episode Who Can You Trust? when Lindsay and Trent for the Screaming Gophers are up against Bridgette and Geoff for the Killer Bass. The fish contains enough poison to kill thirty people. They must be sliced very carefully to cut around all the poisonous organs. The poison paralyzes the nerves and there is no known antidote. Bridgette is able to successfully prepare the blowfish in the form of sushi, which she feeds to Geoff. Geoff is shown to not be harmed whatsoever by it. Lindsay, however, prepares a mangled mess of a dish for Trent, who nonetheless eats it. After eating it though, he collapses and convulses, having been poisoned from consuming it. However, he survives, but isn't able to participate in any other challenges for the day, and seems to have a mental disorder for the rest of the episode.

Total Drama Action
The blowfish is next seen in Crouching Courtney, Hidden Owen when the girls have to prepare a Japanese dinner for the winner of the reward challenge. This includes a dish called Kung Fu Noodle Soup, which is made of vegetable broth, noodles, and the "seven deadliest species of fish known to man", of which the fugu blowfish is shown to be one. Beth claims she is allergic to fish when they're still alive, and therefore cannot help Courtney cook it. Courtney eventually manages to cook it, but it seems that she prepared it incorrectly, as Owen was poisoned after tasting the soup.

Trivia

 * Both of the people who have been poisoned by the fugu are voiced by Scott McCord.
 * Geoff is the only known person who has eaten the blowfish who has not been poisoned, due to the fact that Bridgette had prepared it correctly.