Sergeant Dunder is Colonel Ivanod Spigot's second-in-command. He's gregarious and somewhat dense like Wildcat, but nowhere near as self-centered and ruthless as Spigot is. In fact, he's close friends with Baloo and Kit. He selflessly takes the blame for many of Spigot's numerous failures, and appears a devoted soldier. He's a selfless, even-tempered, respectful, good-tempered, exuberant, adventurous, noble, trusting, daring, understanding, nice, diligent, efficient, rebellious, sweet-tempered, genuine, timid, protective, dependable, upbeat, noble, dignified, encouraging and reliable boar.
- He's voiced by Lorenzo Music.