Commander and Private are the characters who appear in the movie in the episode "Heat Signature." The segment of the movie seen in the episode begins with the Private saying to the Commander that he cannot see their own heat signature. Due to the screaming that occurs when the screen is not visible, it is probable that something bad happened to the people.
Their scene takes place within a submarine's control room, with the Private sitting and watching a heat signature monitor. The room has a glowing red light and is otherwise dark.
- A resemblance of a two-headed eagle can be seen on the Commander's cap, suggesting that they are based on a real human army.
- In the Season Two DVD commentary of this episode, Pen Ward stated the movie Heat Signature was an animated movie rather than live action in the Adventure Time world.