The Chronicles of Narnia: The Silver Chair (1990)

The Silver Chair was shown on BBC television in 1990. It was the third and final series of The Chronicles of Narnia that ran from 1988 to 1990. This film is based on the fourth novel in the Chronicles on Narnia series.

Plot
In the book, the Witch enchants the main characters by throwing green powder on a fire that produces a "very sweet and drowsy smell." As they breathe this enchanting scent, the Witch plays music and speaks to them soothingly. After resisting for a bit, one by one they are hypnotized and repeat whatever she tells them.

In this scene in the film, the three protagonists - Eustace, Jill, and their "Marshwiggle" friend Puddleglum - find the lost Prince Rillian of Narnia who has been enchanted and imprisoned by a Witch in her underground realm. They free him from his bonds, he returns to his senses, and they prepare to escape together. However, before they can escape, they encounter the Witch.

The Witch throws magical green powder on a fire pit, which fills the room with a sweet, drowsy smell. This smell makes everyone sleepy and suggestible, especially Eustace and Jill who seem more susceptible to it. As her victims breathe the hypnotic scent, the Witch tries to convince them that her underground realm is the only reality, and that everything else is just a dream. She speaks soothingly with each of them, looking in their eyes and tossing handfulls of her green powder in their faces in her efforts to hypnotize them. Puddleglum and Rillian manage to resist this effort and argue with her. Jill and Eustace try to argue with her too, but she easily hypnotizes with the enchanting smell and by looking into their eyes. They agree with the Witch that their world is "all a dream" and "there never was any world but yours." They look like they are falling asleep. Rillian just watches silently, apparently hypnotized too. Puddleglum still refuses to give in and makes a speech about remembering Narnia. This makes the Witch angry, and she knocks Puddleglum unconscious. This commotion wakes Jill, Eustace, and Rillian from the Witch's spell.

Rillian tries again to argue with the Witch to no avail. He closes his eyes and goes silent, and the Witch turns her attention back to Jill and Eustace. She hypnotizes them again again with her green powder, and they repeat everything she tells them. Jill manages to snap out of it for a moment, but the Witch easily hypnotizes her again. She tells them to forget their world and Narnia as dreams. The Witch then tosses more green powder in their faces, tells them to go to sleep, and they start nodding off. Puddleglum comes to and sees what is happening. He realizes the smell from the fire is what's making his friends hypnotized and sleepy. Before Jill and Eustace fall asleep, Puddleglum stomps out the magical fire to eliminate the enchanting smell. The spell is broken, and Jill and Eustace wake up from their trance for good this time, angering the Witch.