Act 1 1st scene: Prince Caprice On some part of the Earth, on a large square in the capital, King Vlan is preparing a festival in honour of his son, Prince Caprice, who has returned from a long journey undertaken for his education. On Caprice's arrival, King Vlan cedes him the crown, but Caprice refuses it, not wanting to govern or to marry but instead to have liberty, movement, air, space... The Moon, then rising, gives him an idea for his next destination. He asks his father to get him to this unknown and unexplored place. Vlan gives in and asks Microscope, the kingdom's greatest scholar, to find a way of getting there. Microscope replies that this mission regards the observatory.
2nd scene: At the observatory Questioned, the astronomers do not reply and demand a commission. Furious at this evasion, Caprice crosses them off and proposes to do the same to Microscope if he does not find a way to the Moon. Microscope arranges that they meet 8 days later in his forge, and says he will find a way to the Moon in the interim.
3rd scene: At the forge The forge-workers finish their work when Vlan and Caprice arrive 8 days later. Microscope unveils his means of getting to the Moon: a
shell launched by a cannon. Due to the probability that the mission will go wrong, Microscope is forced to accompany Caprice. Vlan accedes to his son's insistent demands and also joins them on the trip.
4th scene: The departure Vlan, Caprice and Microscope get into the shell. The artillery-men light the fuse and, with a huge detonation, the shell hurtles towards the Moon.
Act 2 5th scene: The Moon Hearing mysterious voices, we see a town with strange architecture.
6th scene: The arrival The "Sélénites" (Moon-dwellers) fearfully observe a black point in the sky, and one asks another if it may be something sent by the "Terriens" (Earth-people) to exterminate them. Cosmos, king of the Moon, and his counsellor Cactus calm their people – science has proved that the Earth is uninhabited. With a horrendous crash, the shell crash-lands on a house and Vlan, Caprice and Microscope get out, as the "sélénites" hide. The three men observe what seems to be a desolate planet, and their mood blackens, since only apples remain for provisions. Some "sélénites" get up, and Cosmos reappears to ask the "terriens" where they have come from. Their insolent reply makes him condemn them to prison, but Cosmos's wife Popotte and daughter Fantasia arrive. It is Fantasia's birthday, and she asks her father to take pity on the prisoners and free them as her birthday present. Cosmos accepts and proposes that the "terriens" visit his palace.
7th scene: The glass palace Cosmos and Cactus show Vlan, Caprice and Microscope the Moon's civil service. On the Moon, working for the king is not a happy job and if there are no candidates the fattest person is picked.
8th scene: The mother-of-pearl galleries Caprice courts Fantasia, but she does not understand, not knowing what love is, since it does not exist on the Moon other than as a disease – when one wants to have a child, one asks oneself if there is an area of commerce in which it can prosper.
9th scene: The park Caprice, despairing of princess Fantasia and her inability to love him, eats an apple. The princess, astonished by his absence, goes to look for him. Attracted by this fruit (unknown to her), she tastes it. Calling it a "charming gift that she formerly ate on the Earth", she immediately falls in love with Caprice, sending the palace into an uproar.
10th scene: The roaming shadows As night falls, the scenery changes and phantom-like creatures appear through the creepers and suddenly lights shine in their heads, then everything disappears. ''11th scene: Cosmos's gardens'' In grand gardens with flowers and water features everywhere the stars and chimères dance.
Act 3 12th scene: The consultation The kingdom's doctors examine Fantasia, shut up in her chamber, mad with love. She escapes and finds Caprice. To save her, Caprice suggests making Cosmos amorous by giving him an apple-based drink. Due to her incurable sickness of love, Cosmos proposes to sell Fantasia, as is the habit on the Moon when a woman ceases to please. Caprice promises Fantasia that he will buy her.
13th scene: The women market On the Moon, the women market is the equivalent of the stock market. Microscope is charged by Caprice with buying the princess and, visiting Quipasseparla ("Who Goes There", king of the stockmarket), he negotiates with him just in case the 'stock price' goes up. Quipasseparla does not accept and is intoxicated to prevent him from participating in the sale. Vlan and Caprice arrive, dressed as charlatans. They suggest an elixir that will, among other things, slim down fat people. This elixir is very precious, and only a king is worthy of it, so Cosmos is its happy beneficiary. Cosmos tastes it and panics, believing himself poisoned – in fact, they have made him discover alcohol. Quipasseparla wins Fantasia at the sale.
14th scene: The land of the paunchy Quipasseparla and his harem arrive in the land of the paunchy where they stop at an inn. Microscope arrives, followed by Popotte who is, in turn, followed by Cosmos, who has fallen madly in love with her. Popotte does not return his love and so he had made her drink the elixir that will make her fall in love, but Microscope happens to be passing at that moment and she has instead fallen in love with him! Vlan and Caprice arrive in search of Fantasia. Vlan stops for dinner, whilst Caprice finds Fantasia again and flees with her. Furious at being in love and at being trumped by his wife, Cosmos arrives... The inn goes mad, Vlan and Microscope are unmasked despite their fake paunches. The royal guards go in pursuit of Caprice and Fantasia and bring them back. Quipasseparla renounces the princess. Winter immediately follows summer in this country and so they only get back to the capital under the snow.
15th scene: 50 degrees below zero Grand ballet of the snowflakes: this scene gave rise to the popularity of snow dances, the most famous of which is that in
The Nutcracker.
Act 4 16th scene: The imprisonment of the apple-bearers The Moon-women discover love, but King Cosmos does not hear of it. Vlan, Caprice and Microscope are brought before a court and condemned "to pass five years inside an extinct volcano, where they will be wholly deprived of any kind of nourishment".
17th scene: The glacier Brought to the top of the volcano, they take their places in a basket with Cosmos to be lowered into the crater.
18th scene: The crater Arriving at the bottom, Popotte cuts the cord, reproaching her husband for want to cause Microscope to perish. Fantasia is found to have stowed away in the basket, wanting to die with Caprice. In this desperate situation, Cosmos promises the prisoners their liberty if they can find a way out.
19th scene: The interior of the volcano They search for a way out amidst rumbles and detonations. The volcano begins to erupt.
20th scene: The eruption The scene fills with fire and smoke; Microscope is sent into space by an explosion; Vlan and Cosmos try to find a way out. Lava fills the stage.
21st scene: The rain of ash Ash rains down, covering all the scenery. ''22nd scene: The volcano's summit after the eruption'' Caprice, Fantasia, Cosmos and Vlan lying on the ground, having fainted. Microscope has hidden in a crevice, and wakes them. Popotte rushes to them – they are saved.
23rd scene: Le clair de terre (The earth-light – a pun on (moonlight)) The earth rises and shines on the stage as a aurora borealis – people rush on and sing the final chorus, greeting earth whose light shines through space. ==Musical numbers==