Undertow

"Face it Triton, you're all washed up."

- Undertow to King Triton.

Undertow is the tertiary antagonist of The Little Mermaid II: Return to the Sea. He is Morgana's pet tiger shark and henchman.

History
He is summoned by Morgana to eat the baby princess Melody, but King Triton turns him into a small, piranha-like fish, much to his chagrin. Undertow soon becomes obsessed with becoming a full-sized shark again, but Morgana's magic doesn't work, and he remains small throughout most of the film. He helps to deceive the older Melody into joining Morgana and getting Triton's trident.

When Morgana finally gets the trident, she turns Undertow back into his original size, at an opportune time. He is sent after the penguin/walrus duo, Tip and Dash, when they go to rescue Melody, and he attempts to eat them. Tip and Dash, however, manage to hold him off and steer him into an ice wall that served as Melody's prison. Undertow shattered through the ice and was smashed against the rock wall behind it. All of his (very un-shark-like) teeth were broken, but it is unknown if he died or not.

Trivia

 * Undertow is voiced by Clancy Brown, who has played and voiced a variety of villains. Notable examples include: The Kurgan and Mr. Krabs.