In a twist on the classic “Moby Dick,” Tom is press-ganged aboard the ship of a mad, one-legged sea captain obsessed with the whale Dicky Moe. Made to scrub the decks aboard the “Kumquat,” Tom gets unhelpful assistance from Jerry, who substitutes tar for water. When Dicky Moe is sighted, the captain fires a cannon at him, and the whale takes off, with Tom roped to his side.