Who voiced Lieutenant Mattias in Frozen II?

Sterling K. Brown voiced Lieutenant Mattias in Frozen II.

Mattias is an Arendellian officer who served as King Runeard's lieutenant and Prince Agnarr's guard. During the conflict between Arendelle and the Northuldra, Mattias and other soldiers became trapped in the Enchanted Forest, where an enchanted mist kept them isolated for decades.

When Elsa and Anna enter the forest, they encounter Mattias and the surviving Arendellian soldiers. His experience helps reveal the truth behind the historical conflict, including Runeard's betrayal of the Northuldra and the dam built in their homeland. Mattias ultimately returns to Arendelle after the forest's crisis is resolved.

The character is sometimes described as General Mattias because Anna later promotes him under her reign. The film and cast listings identify him as Lieutenant Mattias, while later character references use General Destin Mattias. Sterling K. Brown is also known for This Is Us and for voicing a character in The Angry Birds Movie 2.