Grampus is a 'midget' submarine once owned by the navy. He is a close friend with the Star Fleet and has helped them out in various situations. He appeared for the first time in "Pirate", in which he helped to prove Ten Cents' innocence. In Regatta, he was nearly blown up by Bluenose the naval tug having been branded as 'too old' for further service. He speaks with a Central English accent (with a noticeable lisp). In "Regatta", he saved Lillie Lightship from sinking by plugging the hole in her side with his head.