The Coast Guard Messenger is a small motor boat with a shrill whistle. He makes a speaking appearance in the episode Regatta and has a cameo appearance in the episode Sunshine. He makes a small non-speaking role in Quarantine as the mad speed boat that nearly crashes into O.J.
- In Salty's Lighthouse, he and the Coast Guard are combined together to create one character named "Cappy".
- The Coast Guard Messenger's whistle is similar the Coast Guard's, but with a clearer sound.