Donja Juan in a man's suit - green pants and a camisole - arrives from his native Valladolid in Madrid. Quintana, her old faithful servant, accompanies her. He asks Madam why she left her father's house and travels in masculine guise. Juana says that on Easter, in April, she went out for a walk and met a beautiful stranger whom she fell in love with at first sight. She could not sleep at night, and, opening the door to the balcony, she saw a handsome man below. Don Martin de Guzmán sang serenades at night, sent letters and gifts during the day. In less than two months, Juan surrendered. But when Martin Don’s father Andres found out about their love, a terrible scandal erupted. Juan comes from a noble but impoverished family, and the old man appreciates only gold. He wants to marry his son to Ines, the daughter of his friend Don Pedro, but is afraid that Juan will sue the seducer and the oath-breaker. Therefore, Andres decided to send Martin to Madrid under a false name. He wrote to Pedro that his son had tied himself with Juana, but he found for Ines a suitable bridegroom - Don Gil de Albornos, who is not only good-born and rich, but also young and handsome. Martin dutifully went to Madrid under the name of Don Gil. Having learned about this, Juana follows him. So that Martin does not recognize her, she sends Kintan to Vallecas, promising to send him a letter, and hires herself a new servant - Karamanchel. Karamanchel changed many owners: he served with a doctor who prescribed the same medicines to everyone, a corrupt lawyer, a glutton-priest. Karamanchel is surprised at the unmanly appearance of his new master and says that he looks like a castrate. Juana calls himself Don Gil.
Martin comes to Pedro and hands him a letter from Andres, where he praises Don Gil in every way. Martin says that he wants to get married with Ines as soon as possible because his father chose another bride: if the father finds out about his son’s desire to marry Ines, he will deprive him of his inheritance, Pedro is ready to hurry up with the wedding: he fully trusts Andres and will not waste time on verification of information about the groom. Pedro promises to speak with his daughter today. He will not yet give her the name of the groom, and that evening in the Ducal Garden, she furtively declares her love. Martin is delighted with his own tricks.
Juan, in love with Ines, begs her not to go to the Ducal Garden: he is tormented by a bad foreboding. But Ines already promised her cousin to go there with her. Ines assures Juan of his love and invites him to come to the garden too.
Pedro talks to Ines about the bridegroom, claiming that Juan is not suitable for him. Ines is unhappy that she has been handed a husband to a man whom she did not even see. Upon learning that the groom’s name is Don Gil, she exclaims: “Don Gil? God have mercy! / What is the name! My husband - / Christmas shepherd in a mat / Or sheepskin! ” Upon learning that Gil was waiting for her in the Ducal Garden. Ines is afraid that he would not meet with Juan there.
Donja Juan in a man’s costume appears in the Ducal Garden. Having bribed the servants, she knows about every step of her rival. Seeing Ines, her cousin Clara and Juan, she speaks to them and captivates the ladies with her courtesy and beauty. Juan suffers from jealousy. Hearing that Juana has arrived from Valladolid, Ines asks her about Gila. Juana says her name is also Gil. Ines decides that this is the groom whom her father read to her. A handsome young man is to her liking, and Ines is ready to give her hand to him. Juana promises to come under the window to Ines at night, and Ines is looking forward to meeting. Ines tells his father that he will happily marry Gil. But when he sees Martin, whom Pedro introduces to her as Gil, he realizes that this is not the same Gil with whom she is in love.Her chosen one “Speech is flowing with a honey river / His eyes sparkle brighter than stars” and green pants. Martin promises to come to her tomorrow in green pants.
Doña Juana tells Quintana about his successes: Ines is crazy about her, and Martin is furious everywhere looking for a double opponent to pierce his sword.
Calling himself Elvira, Juana rents a house next to the house of Ines. Having met in the garden, the ladies get acquainted and become friends. Juan reminds Ines of his disappeared lover, and Ines trusts her with all his sorrows - in this way, Juana knows Martin's every move. Juana is afraid that Martin would not suspect that Gil is not Gil at all, but disguised as Juan. She sends Kintan to Martin with the news that after his departure, Juan, who bears the fruit of his love beneath her heart, retired to the monastery and there she shed tears day and night. If Martin does not return to her, she would prefer death to dishonor. Juana is sure that, having received such a letter, Martin will believe in the existence of don Gil.
Don Juan suffers from jealousy. Ines admits that Gil, dear to her heart, disappeared, but another, self-styled Gil appeared, and her father forces her to marry him. She asks Juan to kill an opponent. For the sake of Ines Juan, I’m ready to deal with the impostor today. Ines hopes that getting rid of the false Gil will be able to marry Gil's Green Pants.
Ines visits his new girlfriend Elvira. Elvira tells her that she came from Castile. From childhood, she loves Don Miguel de Ribera, who reciprocated with her. But when she surrendered to him, he soon forgot all his oaths and left her. Upon learning that Miguel went to Valladolid, Elvira went after him. Miguel’s friend, Don Gil de Albornos, boasted that a rich and beautiful bride was waiting for him in Madrid, and Miguel, having stolen Don Andres’s letter from Gil, called himself Gil to marry Ines himself. Fate brought “Elvira” with Khil Green pants, looking like her like two drops of water, and the young man fell in love with her. But "Elvira" says that he loves only Miguel’s anemone, and with all his might tries to return it. The ladies find out that Ines does not like Miguel, and Elvira does not like Gil.
Quintana gives Martin a note from Juana, who is supposedly in the monastery. Martin, suspecting that Juan is in Madrid and pursuing him, calms down. After reading the letter of Juana, he is filled with tenderness for her. Martin assures Quintan that he came to Madrid only to petition the king, and in a few days he will return to Juan. He wants to write an answer to Juana and promises to bring it to Quintana the next day. Left alone, Martin reflects on the unworthiness of a nobleman to deceive a woman who is expecting a child from him, and decides to return home.
Juan challenges Martin to a duel. Martin suggests settling the matter with the world: let Ines make a choice herself. Juan says that Ines cannot refuse Martin, because she does not dare to disobey her father, she cries, but she is ready to come to terms and give her hand to Martin. It’s a pity to Martin to lose faithful prey, and having forgotten about his love for Juan, he decides to marry Ines. Martin does not accept the challenge of Juan, believing that it is stupid to fight before the wedding - in a month he is ready to fight with a rival. The servant brings Martin a package from his father in the name of don Gil de Albornos: it contains three letters - to Martin, don Pedro and the merchant Agustin Soller, who must give the money to the messenger of don Gil de Albornos. Hurrying to Ines, Martin loses his letters. They are found by Karamanchel, who gives them to Juan, confident that she is Gil. Juana sends Quintana for money.
Ines tells his father that the groom he introduced to her is not Gil at all, but Miguel. Don Pedro is completely baffled. Ines tells him everything that Elvira told her. Don Pedro is outraged by the impudence imposter. Ines promises to present him with the real Don Gil. Juan appears in green pants. She tells how Miguel deceived her trust and stole letters. But now she has received new letters from her father and can convict the impostor of a lie.Pedro reads Andres's letter and is imbued with the confidence that Juan is the true don Gil. When Martin appears, Pedro and Ines expose him as a liar and an impostor. The servant sent to the merchant Soller returns empty-handed: don Gil has already taken the money intended for him. Martin is furious: an unknown double has ruined all his plans.
Quintana brings Martin the news of the death of Juan. Martin decides that don Gil is Juan who has risen from the tomb to punish him. Quintana picks up this idea and tells that after death, Juana comes to his father's house under the guise of a certain Gil and curses Martin, who forgot his real name. Martin wants to order five hundred masses so that the spirit of Juana will be humble and calm. Ines asks Karamanchel where his master is. Karamanchel replies that his master, Don Gil, Green trousers is often with Elvira and leaves her at dawn. Ines does not believe, but Karamanchel shows her Don Gil's love letter to Elvira. Ines is ready to give her hand to Juan if he kills the infidel Gil Green pants.
Juana, having learned from Quintana that Martin had never abandoned the idea of marrying Ines, writes to his father that he is on his deathbed, and her killer, Martin, is hiding under the name of Gil to avoid revenge on her relatives. After reading her letter, the father will immediately go to Madrid, and Martin will have to be tight.
Accidentally meeting cousin Ines Clara, also in love with Gil Green pants, Juan in a man's suit declares his love to her. Ines, who hears their conversation and Gil’s unflattering feedback about herself, decides to marry Miguel with grief. She urges Miguel to pierce the traitor Gil’s sword, but Juan, afraid of meeting Miguel, says that she is dressed as Elvira: tormented by jealousy, she wanted to find out if Ines really love Gil and not her Miguel, and she wrote a love letter on behalf of Gil to Elvira. Elvira’s men's suit was allegedly lent from Gil, who only Ines loves.
Karamanchel was instructed to transmit a letter to Elvira. Seeing her, he marvels at her resemblance to his master: “Chur, chur me! Don Gil in the mantilla! / I’m kind of sober and not delirious ... / Both have a place for them in hell - / And to Khil this and Hiliy! ” Elvira promises Karamanchel that in an hour he will see her and his master together. But Karamanchel does not believe and believes that Elvira is a disguised Gil.
Don Juan is looking for his rivals, bearing the same name Gil. "There are two of them, and to her window / Both will deign to appear: / So let them kill me / Or I will pierce both of them." He hurries under the window to Ines. Ines in the dark takes him for his lover - Gil Green Pants. Juan does not dissuade her. Soon, Martin appears, who also put on his green pants. Seeing Juan talking with Ines, he decides that this is his elusive double, but the idea that it may be the ghost of the late Juana inspires fear in him. Don Juan recognizes in Martin the false Gil, whom Ines hates. Juan challenges him to a duel. Ines, seeing two young people in green pants, can not understand what is the matter. The Elvira peers out of its window and tells Ines that the traitor Miguel has come here. Martin, mistaking Juan for the spirit of don Juan, disappears in fear. Clara appears in a man's suit. She came to check if Gil was secretly meeting with Ines. Pretending to be Gil, she speaks Ines gentle words. Observing the whole scene from the side of Karamanchel exclaims: “It’s not that I see dreams when standing, / It was not here that the rain came from Hiley”. Juan threatens to kill Clara. Juana changes into a man’s dress, goes down and also approaches the Ines window. Juan, Juan and Clara argue over which of them is the real Gil. Juan rushes to Juan with a sword. Instead, Quintana fights with him. Juan is injured.
Juan's father, Don Diego, having received a letter from his daughter, comes to Madrid to avenge her killer Martin. Martin swears that he did not kill Juan, calling Quintana to be a witness, but he claims that Martin stabbed Juan. Algvasil takes Martin into custody. Juan, Juan, Ines, Clara and don Pedro appear.Juan tells the whole truth, reveals all the tricks that she went to in order to return Martin, Martin is happy that he avoided danger. He asks for forgiveness from Juana and her hands from don Pedro. Ines agrees with don Juan, and Clara is ready to become the wife of her longtime admirer don Antonio.
