They are a pair of bodyguards hired by the scheming Duke of Weselton to protect and serve him at all costs.
The guards first appear, along with the Duke, entering Arendelle from the docks and nearing the castle gates. As they move towards them, the Duke expresses excitement as he greatly looks forward to unlocking its secrets and exploiting its riches. However, he accidentally says this out loud to his guards. At the coronation ball, when Elsa accidentally reveals her winter powers, the Duke deems her magic dangerous, and orders his men to capture her the moment she flees, though he and his goons were nearly killed by an accidental blast caused by the queen, resulting in the Duke calling her out as a monster. Elsa escapes from the scene into the mountains, but accidentally casts a powerful curse over Arendelle, putting it into an eternal winter. Princess Anna departs to go after the queen, and leaves Hans in charge. However, when her horse returns with the princess missing, Hans believes that the princess is in danger, and asks volunteers to journey to Queen Elsa's palace with him to find her. The Duke volunteers his bodyguards, and secretly orders them to eliminate Elsa should they find her so they could put an end to the winter.