Torpedo Ted

Torpedo Teds are torpedoes that move underwater. Torpedo Teds are relatives of the much more common Bullet Bills, but the torpedoes are larger than their bullet brethren. The torpedoes are dropped by Skull Boxes, just as Bullet Bills are fired from Bill Blasters.

Super Mario World
Torpedo Teds first appeared in Super Mario World and were only seen in Soda Lake. Mario and Yoshi encountered Torpedo Teds during their adventures in Dinosaur Land. Torpedo Teds moved fairly fast and could be hard to avoid due to the narrow pathways within Soda Lake. Unlike Bullet Bills, Torpedo Teds were invincible to all of Mario's attacks.

Super Mario Galaxy
Torpedo Teds appear in Super Mario Galaxy after many years of absence in the main Super Mario series. They only appear in Buoy Base Galaxy and Drip Drop Galaxy. Torpedo Teds resemble and act like the Bullet Bills featured in this game. As such, they would home in on Mario then explode, just like a Bullet Bill. However, these Torpedo Teds make a beeping noise based on how close they are to Mario, unlike Bullet Bills. Torpedo Teds are also fired from cannons that resemble underwater Bill Blasters. In this game, these torpedo enemies could only be defeated by Rainbow Mario, or by causing them to crash into a wall, each other, or some other object, such as a cage.

New Super Mario Bros. U
Torpedo Teds reappear in New Super Mario Bros. U alongside Skull Boxes. In this game, they are similar to those in Super Mario World in both appearance and behavior. Red Skull Boxes appearing in the game launch a red version of Torpedo Teds known as Targeting Teds, which chase Mario in a way similar to a Fish Bone or Bull's-Eye Bill. If the player freezes one, it will break out immediately. Torpedo Teds can be defeated from Boost Mode; in this case, when it is frozen, the player can tap on the ice block quickly and Boost Star Mode. Also, simply freezing them when another Torpedo Ted is right in front of them will defeat them (the frozen one will shatter, the other will just continue going forward.

New Super Luigi U
Torpedo Ted reappear in the extension game New Super Luigi U. They appear in the first boss battle with Bowser Jr. and in Larry's Trigger-Happy Castle.

Super Mario World television series
A Torpedo Ted, though not specifically named as such, appears in the final episode of the Super Mario World cartoon. In the episode, titled "Mama Luigi," Luigi and Yoshi, after narrowly escaping a pursuing Rip Van Fish, were attacked by a Torpedo Ted. This Torpedo Ted chased after them as they swam to the surface; however, the Torpedo Ted missed both of them as they were saved by two friendly Dolphins.

Super Princess Peach
Torpedo Teds reside in a few underwater areas of Vibe Island as depicted in Super Princess Peach, behaving much like they do in Super Mario World. There are also variants that are under the influence of the Vibe Scepter, transforming them into Glad Torpedo Teds.

Mario Party 10
Torpedo Teds reappear in Mario Party 10 in Blooper Blast-Off being fired out by Skull Boxes.

Trivia

 * Torpedo Ted's name, along with Bullet Bill's, could make them a reference to the movie Bill & Ted's Excellent Adventure.