Exposition: Narrator explains Hop-frog and the King with his fat ministers. The Story takes place in a far-off kingdom. Hop-frog is a dwarf and a cripple, kept for the king's entertainment. The king also has another captive Dwarf, whom Hop-frog quickly becomes friends with. A fete is set to occur on a coming eve, but the king and his ministers don't have costumes for the Masquerade.
Inciting Action: Hop-frog drinks a lot of wine, and makes a loud grinding noise with his teeth, after the king threw a wine glass at Trippetta, because Hop-frog didn't take more wine from the king. All of this happened before Hop-frog found a costume idea.
Rising Actions: The fete arrives, with the guests all in the room. The King and his ministers barge in, and chaos ensues.
Climax: The "Beasts" have been running around, generally causing a ruckus with Hop-frog following them like a zoo-keeper. He brings the King and ministers to a suspended chain in the center of the room, hooks them up, and then has them lifted. Hop-frog thinks he knows who the people under the fur are. He grabs a torch to see better, looks a little too close, and... bye-bye ourang-outangs.
"I now see distinctly what manner of people these maskers are. They are a great king and his seven privy councilors -- a king who does not scruple to strike a defenseless girl, and his seven councilors who abet him in the outrage. As for myself, I am only Hop-frog, the jester -- and this is my last jest." (Poe 9)
Hop-frog exits through the roof and is never seen again. Some think Trippetta was his accomplice, as she disappeared, too.