Lobster Mobster and Da Shrimp are recurring antagonists from The Little Mermaid television series. They are bumbling con-artists and constantly antagonize Ariel and her friends. They are modeled after 1920s gangster stereotypes.
Their first appearance was the episode, "Urchin". Here they meet an orphaned mer-boy named Urchin and swindle him into working for them posing themselves as something he desires; friends. Eventually, he meets Ariel who convinces him that Lobster Mobster and his sidekick are not his allies and are just using him.
Later, they appeared in "Double Bubble", where they kidnapped a troublesome pair of baby mertwins that Ariel babysat to gain their mother's pearl necklace.
The duo also appeared in the episode, "Thingamajigger".