Old Fred is one of the protagonists in the film Yellow Submarine.
Fred submarine-1-

Old Fred piloting the Yellow Submarine

He is seen to have a very strong friendship with the Lord Mayor of Pepperland, who appoints him Lord Admiral. This gives Fred the pluck to go find help (Ringo), but not to articulate the situation coherently; the only intelligible words include, "music," "explosions," "mayor," "submarine," and "Blue Meanies." Unfazed, Ringo takes Fred to meet his friends, John, Paul, and George, to whom Fred repeats the story exactly.

Though ignorant of what they will find, the four men answer Fred's call for help, board the Yellow Submarine, and voyage to Pepperland.