Shark

The Shark is an animal that appears in Total Drama Island during the theme song, and numerous times during the seasons. Sharks have been responsible for the numerous injuries and deaths of several interns. However, this is only shown in The Very Last Episode, Really!, when an intern falls off a wooden plank bridge in order to test a challenge and is eaten off-screen. The sharks are sometimes shown to be able to breathe on land, but are usually seen in water.

Total Drama Island
In Not So Happy Campers - Part 2, the contestants have to jump off a cliff into a safe zone, surrounded by hungry sharks. The only person who landed outside of the safety spot (aside from Chef) was Justin, who was spared by the sharks, due to their attraction towards him, like most other living beings on the show.

In Who Can You Trust?, a snake eats bunny, which is grabbed by an eagle, and finally, a shark jumps out of the water and eats all of them.

In Haute Camp-ture, the sharks were seen having seaweed mud baths alongside Beth.

In Camp Castaways, the shark is a vicious, dangerous creature who wants to eat the final four. In The Very Last Episode, Really!, the sharks appear in a dangerous challenge where they devour an intern.

The sharks were featured briefly in I Triple Dog Dare You!, in a dare from LeShawna, where Gwen had to tightrope walk across a chasm where three sharks were swimming below; all while carrying a long pole covered in giant steaks and wearing a steak necklace as well. She was able to complete this dare, and earned a freebie for doing so.

In Total Drama, Drama, Drama, Drama Island, fourteen of the contestants dive into the water to grab the case, but a shark eats it, causing the challenge to end. Chris then tells them that they are going to be in season two to determine who will win the million dollar prize.

Total Drama Action
In the second season's theme song, one is seen chasing Owen below the water, until Owen passes gas into one shark's mouth, making it choke. On the beach set, two more sharks appear receiving spa treatments with Beth, while relaxing on beach chairs and wearing sunglasses.

The sharks appear in Beach Blanket Bogus, in a challenge where the contestants needed to stay on a surfboard simulation above water. The sharks were still in love with Justin, and when he fell into the water, one of the sharks rescued Justin from the water and gave him mouth to mouth resuscitation. After he revived, the shark hugs him, pushing Beth and Lindsay away when they rush over, showing its "affection" towards Justin. Chris then gives the sharks break time due to union rules.

The sharks make a cameo appearance in Masters of Disasters. When the challenge requires the teams to escape from a submarine being filled with water, Justin and Izzy open a hatch and a shark's head emerges and tries to bite at the team. However, the two quickly shut the hatch.

A shark is seen once again in Crouching Courtney, Hidden Owen as one of seven dangerous ingredients that Beth and Courtney had to cook to prepare Kung-Fu noodle soup, until it was caught by a giant squid.

One of the sharks was Courtney's "animal buddy" during Top Dog's challenge. The shark was aggravating Courtney throughout the entire episode and Courtney constantly fought with it. While punching the shark's stomach, the shark's lunch came out and Courtney prepared sashimi out of it, giving the meal to Chris and Chef Hatchet. A pack of sharks fought her in the second part of the challenge, with her nearly beating them as she knocked out two of the three. She is thwarted when the last one grabs her PDA, makes calls with it, and threw the PDA over a waterfall, making her dive after it.

Total Drama World Tour
In Jamaica Me Sweat, the first challenge involves swimming in shark infested waters. One of the sharks repeatedly punches Cody when he dives in the water. Later, the same shark chases Gwen after she dives but Gwen is able to escape from it.

The sharks also appear in Niagara Brawls on a boat in the lake below the falls. When the contestants fall off the tightrope, the sharks were waiting at the bottom.

In Hawaiian Punch, the sharks are used for the tiebreaker challenge between Alejandro and Cody to make it more dangerous. After Alejandro defeats Cody, he falls off the platform they were competing on and one of the sharks swallows Cody, but is forced to spit him out when a protective Sierra bangs it against the sand of the beach multiple times.

Trivia

 * Out of all the animals, the sharks are affected the most by Justin's looks.
 * According to Chris, they are "rare, but real, man-eating, freshwater sharks".
 * The sharks are largely responsible for Total Drama Action, as one shark ate the case that caused a tiebreaker among the contestants.
 * They are one out of only two animals in the series to have killed somebody, as they ate an Intern alive (off-screen) in The Very Last Episode, Really!.
 * The other is the scarab, an army of which swarmed an intern and ate him alive, reducing him to only a skeleton, in Walk Like An Egyptian - Part 2.
 * The shark is the only animal in the Total Drama series that appears in the first two openings of the series.
 * The shark is shown in the Total Drama Action Alternate Realities video from CN Video. Duncan was using Harold for bait to catch a shark.
 * Oddly, the sharks can survive outside the water as shown in Haute Camp-ture, Total Drama Action theme song, and Beach Blanket Bogus which is impossible in reality.
 * They seem to enjoy human relaxation techniques, such as seaweed mud wraps, spa treatments, watching the beach, and drinking tea.
 * All relaxation techniques were done alongside with Beth.
 * The sharks were the first animals to be a part of a challenge. They were used in Not So Happy Campers - Part 2's challenge.
 * The shark has been the first and, so far, last animal to be used in a challenge.