The Beagle Boys make their debut in Kingdom Hearts 3D: Dream Drop Distance. They appear in the Country of the Musketeers world, where they serve as the henchmen of Captain Pete, the corrupt leader of the musketeers. These Beagle Boys originate from the direct-to-video Disney film, Mickey, Donald, Goofy: The Three Musketeers.
The Beagle Boys were first confirmed to appear in the 2012 Jump Festa trailer. They are the second characters in the series to originate from a direct-to-video film, the first being Experiment 221. After Claude Frollo, they are the second new Disney Villain confirmed for the game.
The Beagle Boys differ only in size and attitude, since their attire is the same, that of black uniforms with dark brown hooded cloaks. They each sport a rapier used in 17th century France.
Together, they are loyal to their boss, Pete, but bumble almost everything they tasked with. Thought they are clever enough to come up with traps, they still manage to mess up.
The Beagle Boys were created in 1951 by Carl Barks as recurring villains for Scrooge McDuck in the character's comic book stories. They are a clan of criminals who frequently attempt to rob Scrooge's Money Bin, a task they fail at more often than not. In the comics they usually bore no specific names, and did not have any specific physical differences other than their arrest card placards. Though they usually work alone (only with fellow Beagles), they have been known to team-up with other criminals like Magica de Spell, Pete, or Mad Madam Mim, or hire out their services to such as Flintheart Glomgold. The Beagle Boys later appeared as regular antagonists on the animated series DuckTales, where they were given individual designs and personalities.
In Mickey, Donald, and Goofy: The Three Musketeers, these particular Beagle Boys are first seen at Princess Minnie's palace, trying to drop a safe onto her. Their attempt fails, and they run off to tell their boss, revealed to be Pete, captain of the Royal Musketeers. Pete is outraged at the Beagle Boys, as the plan was not to kill the princess, but to capture her so that he can become king. As punishment, they are dropped into a shallow "pit" as punishment, and later they are again sent to kidnap Minnie. They waylay her coach and lock her in a tower, but they are thwarted by new Musketeers Mickey, Donald, and Goofy. When Pete changes his plans to kidnapping her at the opera, the Beagle Boys catch Donald and bring him to Pete. At the opera, Pete and two of the Beagle Boys capture Minnie and lock her in a trunk, while the shortest one impersonates her and declares Pete king. Mickey, Donald and Goofy confront the Beagle Boys backstage, and during the battle, they are dropped through the stage. They are not seen again for the rest of the movie.